title: Gavin Newsom

text: During Newsom's time as supervisor, he supported housing projects through public-private partnerships to increase homeownership and affordable housing in San Francisco. He supported HOPE, a failed local ballot measure that would have allowed an increased condo-conversion rate if a certain percentage of tenants within a building were buying their units. As a candidate for mayor, he supported building 10,000 new housing units to create 15,000 new construction jobs.


title: Gavin Newsom

text: Newsom's signature achievement as a supervisor was a voter initiative called Care Not Cash (Measure N), which offered care, supportive housing, drug treatment, and help from behavioral health specialists for the homeless in lieu of direct cash aid from the state's general assistance program. Many homeless rights advocates protested against the initiative. "Progressives and Democrats, nuns and priests, homeless advocates and homeless people were furious", Newsom said. The successfully passed ballot measure raised his political profile and provided the volunteers, donors, and campaign staff that helped make him a leading contender for the mayorship in 2003. In a city audit conducted four years after the inception of program and released in 2008, the program was evaluated as largely successful.


title: Gavin Newsom

text: Newsom placed first in the November 4, 2003, general election in a nine-person field. He received 41.9% of the vote to Green Party candidate Matt Gonzalez's 19.6% in the first round of balloting, but he faced a closer race in the December 9 runoff, when many of the city's progressive groups supported Gonzalez. The race was partisan, with attacks against Gonzalez for his support of Ralph Nader in the 2000 presidential election, and attacks against Newsom for contributing $500 to a Republican slate mailer in 2000 that endorsed issues Newsom supported. Democratic leadership felt they needed to reinforce San Francisco as a Democratic stronghold after losing the 2000 presidential election and the 2003 gubernatorial recall election to Arnold Schwarzenegger. National Democratic Party figures, including Bill Clinton, Al Gore, and Jesse Jackson, campaigned for Newsom. Five supervisors endorsed Gonzalez, while Willie Brown endorsed Newsom.


title: Gavin Newsom

text: Newsom won the runoff with 53% of the vote to Gonzalez's 47%, a margin of 11,000 votes. He ran as a business-friendly centrist Democrat and a moderate in San Francisco politics; some of his opponents called him conservative. Newsom claimed he was a centrist in the Dianne Feinstein mold. He ran on the slogan "great cities, great ideas", and presented over 21 policy papers. He pledged to continue working on San Francisco's homelessness issue.


title: Gavin Newsom

text: Newsom was sworn in as mayor on January 3, 2004. He called for unity among the city's political factions, and promised to address the issues of public schools, potholes and affordable housing. Newsom said he was "a different kind of leader" who "isn't afraid to solve even the toughest problems".


title: Gavin Newsom

text: San Francisco's progressive community tried to field a candidate to run a strong campaign against Newsom. Supervisors Ross Mirkarimi and Chris Daly considered running, but both declined. Gonzalez also decided not to challenge Newsom again.


title: Gavin Newsom

text: When the August 10, 2007, filing deadline passed, San Francisco's discussion shifted to talk about Newsom's second term. He was challenged in the election by 13 candidates, including George Davis, a nudist activist, and Michael Powers, owner of the Power Exchange sex club. Conservative former supervisor Tony Hall withdrew by early September due to lack of support.


title: Gavin Newsom

text: The "San Francisco Chronicle" declared in August 2007 that Newsom faced no "serious threat to his re-election bid", having raised $1.6 million for his reelection campaign by early August. He was reelected on November 6 with over 72% of the vote. Upon taking office for a second term, Newsom promised to focus on the environment, homelessness, health care, education, housing, and rebuilding San Francisco General Hospital.


title: Gavin Newsom

text: He gained national attention in 2004 when he directed the San Francisco city–county clerk to issue marriage licenses to same-sex couples, violating the state law passed in 2000. Implementation of Care Not Cash, the initiative he had sponsored as a supervisor, began on July 1, 2004. As part of the initiative, 5,000 more homeless people were given permanent shelter in the city. About 2,000 people had been placed into permanent housing with support by 2007. Other programs Newsom initiated to end chronic homelessness included the San Francisco Homeless Outreach Team (SF HOT) and Project Homeless Connect (PHC), which placed 2,000 homeless people into permanent housing and provided 5,000 additional affordable rental units in the city.


title: Gavin Newsom

text: During a strike by hotel workers against a dozen San Francisco hotels, Newsom joined UNITE HERE union members on a picket line in front of the Westin St. Francis Hotel on October 27, 2004. He vowed that the city would boycott the hotels by not sponsoring city events at them until they agreed to a contract with workers. The contract dispute was settled in September 2006.


title: Gavin Newsom

text: In 2005, Newsom pushed for a state law to allow California communities to create policy restricting certain breeds of dogs. In 2007, he signed the law establishing Healthy San Francisco to provide city residents with universal health care, the first city in the nation to do so.


title: Gavin Newsom

text: Newsom came under attack from the San Francisco Democratic Party in 2009 for his failure to implement the City of San Francisco's sanctuary city rule, under which the city was to not assist U.S. Immigration and Customs Enforcement.


title: Gavin Newsom

text: The same year, Newsom received the Leadership for Healthy Communities Award, along with Mayor Michael Bloomberg of New York City and three other public officials, for his commitment to making healthful food and physical activity options more accessible to children and families. He hosted the Urban-Rural Roundtable in 2008 to explore ways to promote regional food development and increased access to healthy, affordable food. Newsom secured $8 million in federal and local funds for the Better Streets program, which ensures that public health perspectives are fully integrated into urban planning processes. He signed a menu-labeling bill into law, requiring that chain restaurants print nutrition information on their menus.


title: Gavin Newsom

text: Newsom was named "America's Most Social Mayor" in 2010 by Same Point, based on analysis of the social media profiles of mayors of the 100 largest U.S. cities.


title: Gavin Newsom

text: Newsom gained national attention in 2004 when he directed the San Francisco city–county clerk to issue marriage licenses to same-sex couples, violating state law. In August 2004, the Supreme Court of California annulled the marriages Newsom had authorized, as they conflicted with state law. Still, Newsom's unexpected move brought national attention to the issue of same-sex marriage, solidifying political support for him in San Francisco and in the LGBTQ+ community.


title: Gavin Newsom

text: During the 2008 election, Newsom opposed Proposition 8, the ballot initiative to reverse the Supreme Court of California ruling that there was a constitutional right to same-sex marriage. Proposition 8 supporters released a commercial featuring footage of Newsom saying the following in a speech regarding same-sex marriage: "This door's wide open now. It's going to happen, whether you like it or not." Some observers noted that polls shifted in favor of Proposition 8 after the commercial's release; this, in turn, led to speculation that Newsom had inadvertently played a role in the amendment's passage.


title: Gavin Newsom

text: In April 2009, Newsom announced his candidacy for governor of California in the 2010 election. He received the endorsement of former President Bill Clinton in September 2009. During the campaign, Newsom remarked that, if elected, he would like to be known as "The Gavinator" (a reference to the nickname of incumbent Governor Arnold Schwarzenegger, "The Governator"). Throughout the campaign, he had low poll numbers, trailing Democratic frontrunner Jerry Brown by more than 20 points in most polls. Newsom dropped out of the race in October 2009.


title: Gavin Newsom

text: Newsom filed initial paperwork to run for lieutenant governor in February 2010, and officially announced his candidacy in March. He received the Democratic nomination in June and won the election on November 2, 2010. Newsom was sworn in as lieutenant governor on January 10, 2011, and served under Governor Jerry Brown. The one-week delay was to ensure that a successor as mayor of San Francisco was chosen before he left office. Edwin M. Lee, the city administrator, took office the day after Newsom was sworn in as lieutenant governor. He debuted on Current TV as the host of "The Gavin Newsom Show" in May 2012. The same month, Newsom drew criticism for negative comments about Sacramento, calling it "dull" and saying he was only there once a week, adding, "there's no reason" to be there otherwise.


title: Gavin Newsom

text: Newsom was reelected as lieutenant governor on November 4, 2014, defeating Republican Ron Nehring with 57.2% of the vote. His second term began on January 5, 2015.


title: Gavin Newsom

text: Newsom supported a failed measure in 2012 that sought to end capital punishment in California. He claimed the initiative would save California millions of dollars, citing statistics that California had spent $5 billion since 1978 to execute just 13 people.


title: Gavin Newsom

text: In 2016, Newsom supported Proposition 62, which also would have repealed the death penalty in California. He argued that Prop. 62 would get rid of a system "that is administered with troubling racial disparities" and said that the death penalty was fundamentally immoral and did not deter crime. Proposition 62 failed.


title: Gavin Newsom

text: In 2014, Newsom was the only statewide politician to endorse California Proposition 47, legislation that recategorized certain nonviolent offenses like drug and property crimes as misdemeanors as opposed to felonies. Voters passed the measure on November 4, 2014.


title: Gavin Newsom

text: In July 2015, Newsom released the Blue Ribbon Commission on Marijuana Policy's final report, which he had convened with the American Civil Liberties Union of California in 2013. The report's recommendations to regulate marijuana were intended to inform a legalization measure on the November 2016 ballot. Newsom supported the resulting measure, Proposition 64, which legalized cannabis use and cultivation for California state residents who are 21 or older.


title: Gavin Newsom

text: On February 24, 2017, in response to pro-enforcement statements by White House Press Secretary Sean Spicer, Newsom sent Attorney General Jeff Sessions and President Donald Trump a letter urging them not to increase federal enforcement against recreational cannabis firms opening in California. He wrote: "The government must not strip the legal and publicly supported industry of its business and hand it back to drug cartels and criminals ... Dealers don't card kids. I urge you and your administration to work in partnership with California and the other eight states that have legalized recreational marijuana for adult use in a way that will let us enforce our state laws that protect the public and our children while targeting the bad actors." Newsom responded to comments by Spicer that compared cannabis to opioids: "Unlike marijuana, opioids represent an addictive and harmful substance, and I would welcome your administration's focused efforts on tackling this particular public health crisis."


title: Gavin Newsom

text: Newsom joined Long Beach City College Superintendent Eloy Oakley in a November 2015 op-ed calling for the creation of the California College Promise, which would create partnerships between public schools, public universities, and employers and offer a free community college education. Throughout 2016, he joined Oakland mayor Libby Schaaf at the launch of the Oakland Promise and Second Lady Jill Biden and Los Angeles mayor Eric Garcetti at the launch of the LA Promise. In June 2016, Newsom helped secure $15 million in the state budget to support the creation of promise programs throughout the state.


title: Gavin Newsom

text: In December 2015, Newsom called on the University of California to reclassify computer science courses as a core academic class to incentivize more high schools to offer computer science curriculum. He sponsored successful legislation signed by Governor Brown in September 2016, that began the planning process for expanding computer science education to all state students, beginning as early as kindergarten.


title: Gavin Newsom

text: In 2016, Newsom passed a series of reforms at the University of California to give student-athletes additional academic and injury-related support, and to ensure that contracts for athletic directors and coaches emphasized academic progress. This came in response to several athletics programs, including the University of California – Berkeley's football team, which had the lowest graduation rates in the country.


title: Gavin Newsom

text: Newsom released his first book, "Citizenville: How to Take the Town Square Digital and Reinvent Government", on February 7, 2013. The book discusses the Gov 2.0 movement taking place across the nation. After its release, Newsom began to work with the Center for Information Technology Research in the Interest of Society at the University of California, Berkeley, on the California Report Card (CRC). The CRC is a mobile-optimized platform that allows state residents to "grade" their state on six timely issues. The CRC exemplifies ideas presented in "Citizenville", encouraging direct public involvement in government affairs via technology.


title: Gavin Newsom

text: In 2015, Newsom partnered with the Institute for Advanced Technology and Public Policy at California Polytechnic State University to launch Digital Democracy, an online tool that uses facial and voice recognition to enable users to navigate California legislative proceedings.


title: Gavin Newsom

text: On February 11, 2015, Newsom announced that he was opening a campaign account for governor in the 2018 elections, allowing him to raise funds for a campaign to succeed Brown as governor of California. On June 5, 2018, he finished in the top two in the nonpartisan blanket primary, and he defeated Republican John H. Cox by a landslide in the November 6 general election.


title: Gavin Newsom

text: Several recall attempts were launched against Newsom early in his tenure, but they failed to gain much traction. On February 21, 2020, a recall petition was introduced by Orrin Heatlie, a deputy sheriff in Yolo County. The petition mentioned Newsom's sanctuary state policy and said laws he endorsed favored "foreign nationals, in our country illegally"; said that California had high homelessness, high taxes, and low quality of life; and described other grievances. The California secretary of state approved it for circulation on June 10, 2020.


title: Gavin Newsom

text: Forcing the gubernatorial recall election required a total of 1,495,709 verified signatures. By August 2020, 55,000 signatures were submitted and verified by the secretary of state, and 890 new valid signatures were submitted by October 2020. The petition was initially given a signature deadline of November 17, 2020, but it was extended to March 17, 2021, after Judge James P. Arguelles ruled that petitioners could have more time because of the pandemic. Newsom's attendance at a party at The French Laundry in November 2020, despite his public health measures; voter anger over lockdowns, job losses, school and business closures; and a $31 billion fraud scandal at the state unemployment agency were credited for the recall's growing support. The French Laundry event took place on November 6, and between November 5 and December 7 over 442,000 new signatures were submitted and verified; 1,664,010 verified signatures, representing roughly 98% of the final verified total of 1,719,900, were submitted between November 2020 and March 17, 2021.


title: Gavin Newsom

text: On September 14, 2021, the Associated Press announced the failure of the recall election to obtain the majority of votes required to remove Newsom.


title: Gavin Newsom

text: After U.S. Senator Kamala Harris was elected vice president of the United States in the 2020 presidential election, Newsom appointed Secretary of State of California Alex Padilla to succeed her as California's junior U.S. senator. To replace Padilla as secretary of state, Newsom appointed Assemblywoman Shirley Weber. After the U.S. Senate confirmed Xavier Becerra as U.S. Secretary of Health and Human Services, Newsom appointed Rob Bonta Attorney General of California. In an interview with Joy Reid, Newsom was asked whether he would appoint a Black woman to replace Dianne Feinstein if she were to retire from the Senate or die before her term ended in 2024; Newsom replied that he would.


title: Gavin Newsom

text: On March 13, 2019, three years after voters narrowly rejected its repeal, Newsom declared a moratorium on the state's death penalty, preventing any execution in the state as long as he remained governor. The move also led to the withdrawal of the state's current lethal injection protocol and the execution chamber's closure at San Quentin State Prison. In a "CBS This Morning" interview, Newsom said that the death penalty is "a racist system ... that is perpetuating inequality. It's a system that I cannot in good conscience support." The moratorium granted a temporary reprieve for all 737 inmates on California's death row, then the largest death row in the Western Hemisphere.


title: Gavin Newsom

text: In January 2022, Newsom directed the state to begin dismantling its death row in San Quentin, to be transformed into a "space for rehabilitation programs", as all the condemned inmates are moving to other prisons that have maximum security facilities. The state's voters upheld capital punishment in 2012 and 2016, with the latter measure agreeing to move the condemned to other prisons. Though a 2021 poll by the UC Berkeley Institute of Governmental Studies and co-sponsored by the "Los Angeles Times" suggested declining support for the death penalty among California's voters, Republican opponents criticized Newsom's moves to halt capital punishment in California as defiance of the will of voters, and capital punishment advocates said they denied closure to murder victims' families.


title: Gavin Newsom

text: In response to the Trump administration's crackdown on immigrants with criminal records, Newsom gave heightened consideration to people in this situation. A pardon can eliminate the grounds for deportation of immigrants who would otherwise be legal permanent residents. Pardon requests from people facing deportation are given expedited review by the state Board of Parole Hearings, per a 2018 California law. In his first acts of clemency as governor, Newsom pardoned seven formerly incarcerated people in May 2019, including two Cambodian refugees facing deportation. He pardoned three men who were attempting to avoid being deported to Cambodia or Vietnam in November 2019. They had separately committed crimes when they were each 19 years old. In December 2019, Newsom granted parole to a Cambodian refugee who had been held in a California prison due to a murder case. Although immigrant rights groups wanted Newsom to end policies allowing the transfer to federal agents, the refugee was turned over for possible deportation upon release.


title: Gavin Newsom

text: Newsom denied parole to Sirhan Sirhan on January 13, 2022, the 1968 assassin of Robert F. Kennedy who had been recommended for parole by a parole board after serving 53 years in prison. Newsom wrote an op-ed for the "Los Angeles Times" saying Sirhan "still lacks the insight that would prevent him from making the kind of dangerous and destructive decisions he made in the past. The most glaring proof of Sirhan's deficient insight is his shifting narrative about his assassination of Kennedy, and his current refusal to accept responsibility for it."


title: Gavin Newsom

text: Newsom has spoken in favor of Assembly Bill 1196, which would ban carotid artery restraints and choke holds in California. He has claimed that there is no longer a place for a policing tactic "that literally is designed to stop people's blood from flowing into their brain, that has no place any longer in 21st-century practices."


title: Gavin Newsom

text: In September 2021, Newsom signed legislation raising the minimum age to become a police officer from 18 to 21. Also in the bills were restrictions on the use of tear gas and a ban on police departments employing officers after misconduct or crimes. Among the bills was the George Floyd Bill, requiring officers to intervene when witnessing excessive force on the part of another officer.


title: Gavin Newsom

text: In September 2020, Newsom signed into law a bill allowing California transgender inmates to be placed in prisons that correspond with their gender identity.


title: Gavin Newsom

text: Newsom declared a state of emergency on March 4, 2020, after the first death in California attributable to the novel SARS-CoV-2 coronavirus disease (COVID-19). His stated intention was to help California prepare for and contain COVID-19's spread. The emergency declaration allowed state agencies to more easily procure equipment and services, share information on patients and alleviated restrictions on the use of state-owned properties and facilities. Newsom also announced that mitigation policies for the state's estimated 108,000 unsheltered homeless people would be prioritized, with a significant push to move them indoors.


title: Gavin Newsom

text: Newsom issued an executive order that allowed the state to commandeer hotels and medical facilities to treat COVID-19 patients and permitted government officials to hold teleconferences in private without violating open meeting laws. He also directed local school districts to make their own decisions on school closures, but used an executive order to ensure students' needs would be met whether or not their school was physically open. The U.S. Department of Agriculture approved the Newsom administration's request to offer meal service during school closures, which included families being able to pick up those meals at libraries, parks, or other off-campus locations. Roughly 80% of students at California's public schools receive free or reduced-price meals. This executive order included continued funding for remote learning opportunities and child care options during workday hours.


title: Gavin Newsom

text: As the number of confirmed COVID-19 cases in the state continued to rise, on March 15, Newsom urged people 65 and older and those with chronic health conditions to isolate themselves from others. He also called on bars and brewery and winery tasting rooms to close their doors to patrons. Some local jurisdictions had mandatory closures. The closures were extended to movie theaters and health clubs. He asked restaurants to stop serving meals inside their establishments and offer take-out meals only. His statewide order to stay at home became mandatory on March 19. It allowed movement outside the home for necessities or recreation, but people were required to maintain a safe distance apart. Activity "needed to maintain continuity of operation of the federal critical infrastructure sectors, critical government services, schools, childcare, and construction" was excluded from the order. Essential services such as grocery stores and pharmacies remained open. Newsom provided state funds to pay for protective measures such as hotel room lodging for hospital and other essential workers fearing returning home and infecting family members. By April 26, he had issued 30 executive orders under the state of emergency while the legislature had not been in session.


title: Gavin Newsom

text: On April 28, Newsom, along with the governors of Oregon and Washington, announced a "shared approach" for reopening their economies. His administration outlined key indicators for altering his stay-at-home mandate, including the ability to closely monitor and track potential cases, prevent infection of high-risk people, increase surge capacity at hospitals, develop therapeutics, ensure physical distancing at schools, businesses, and child-care facilities, and develop guidelines for restoring isolation orders if the virus surges. The plan to end the shutdown had four phases. Newsom emphasized that easing restrictions would be based on data, not dates, saying, "We will base reopening plans on facts and data, not on ideology. Not what we want. Not what we hope." Of a return of Major League Baseball and the NFL, he said, "I would move very cautiously in that expectation."


title: Gavin Newsom

text: In early May, Newsom announced that certain retailers could reopen for pickup. Most Californians approved of Newsom's handling of the crisis and were more concerned about reopening too early than too late, but there were demonstrations and protests against these policies. Under pressure, Newsom delegated more decision-making on reopening to the local level. That same month, he announced a plan for registered voters to have the option to vote by mail in the November election. California was the first state in the country to commit to sending mail-in ballots to all registered voters for the November general election.


title: Gavin Newsom

text: As the state opened up, the "Los Angeles Times" found that new coronavirus hospitalizations in California began accelerating around June 15 at a rate not seen since early April, immediately after the virus began rapidly spreading in the state. On June 18, Newsom made face coverings mandatory for all Californians in an effort to reduce COVID-19's spread. Enforcement would be up to business owners, as local law enforcement agencies view non-compliance as a minor infraction. By the end of June, he had ordered seven counties to close bars and nightspots, and recommended eight other counties take action on their own to close those businesses due to a surge of coronavirus cases in some parts of the state. In a regular press conference on July 13 as he was ordering the reinstatement of the shutdown of bars and indoor dining in restaurants, he said, "We're seeing an increase in the spread of the virus, so that's why it's incumbent upon all of us to recognize soberly that COVID-19 is not going away any time soon until there is a vaccine or an effective therapy".


title: Gavin Newsom

text: Newsom oversaw a sluggish initial rollout of vaccines; California had one of the lowest vaccination rates in the country by January 2021, and had only used about 30% of the vaccines it had at its disposal, a far lower rate than other states, by January 20. After reaching high approval ratings, specifically 64% in September 2020, a UC Berkeley Institute of Governmental Studies poll from February 2021 showed that Newsom's approval rate was down to 46%, with 48% disapproval, the highest of his tenure. The "Los Angeles Times" attributed this decline to public opinion of his management of the pandemic. The vaccination rate began increasing in January, with over half the population fully vaccinated as of September 2021, the percentage ranking #16 out of the 50 states.


title: Gavin Newsom

text: Despite Newsom's administration enacting some of the country's toughest pandemic restrictions, California had the 29th-highest death rate out of all 50 states by May 2021. Monica Gandhi, a leading COVID-19 expert from UCSF, said that California's restrictive approach "did not lead to better health outcomes", and criticized California's delay in implementing new CDC recommendations absolving the fully vaccinated from most indoor mask requirements, while saying the decision lacked scientific rationale and could cause "collateral damage".


title: Gavin Newsom

text: In January 2021, the "Los Angeles Times" reported that Newsom's administration had mismanaged $11.4 billion by disbursing unemployment benefits to ineligible claimants, especially those paid through the federally funded Pandemic Unemployment Assistance program. Another $19 billion in claims remained under investigation for fraud. At the same time, legitimate claimants faced lengthy delays in receiving benefits. The state's unemployment system had been overseen by California Labor Secretary Julie Su, a Newsom appointee, whom President Joe Biden later appointed as deputy secretary of labor in February 2021.


title: Gavin Newsom

text: Political opponents attributed the crisis to the Newsom administration's failure to heed multiple warnings by federal officials of the potential for fraud, while Newsom's administration said the Trump administration's failure to provide appropriate guidance for the new federally funded program contributed to the fraud. Experts said much of the fraud appeared to originate from international criminal gangs in 20 countries. A report by California State Auditor Elaine Howle said $810 million was disbursed to claimants who had fraudulently filed on behalf of inmates in the state's prison system.


title: Gavin Newsom

text: According to "The Sacramento Bee", by the summer of 2021, California owed $23 billion to the federal government for unemployment benefits paid out during the pandemic, which was 43% of all unemployment debt, owed by 13 states at the time, to the federal government. Most of this debt was unrelated to the federally funded pandemic unemployment programs that had experienced most of the fraud, and instead was due to longstanding underfunding and California's high rate of unemployment during the pandemic.


title: Gavin Newsom

text: Due to a mass die-off of trees throughout California that could increase the risk of wildfires, Newsom declared a state of emergency on March 22, 2020, in preparation for the 2020 wildfire season. After declaring a state of emergency on August 18, he reported that the state was battling 367 known fires, many sparked by intense thunderstorms on August 16–17. His request for assistance via issuance of a federal disaster declaration in the wake of six major wildfires was first rejected by the Trump administration, but accepted after Trump spoke to Newsom.


title: Gavin Newsom

text: On June 23, 2021, the NPR station CapRadio reported that Newsom and Cal Fire had falsely claimed in January 2020 that of land at risk for wildfires had been treated with fuel breaks and prescribed burns; the actual treated area was , an overstatement of 690%. According to CapRadio, the fuel breaks of the 35 "priority projects" Newsom had touted, which were meant to ensure the quick evacuation of residents while preventing traffic jams and a repeat of events in the 2018 fire that destroyed the town of Paradise, where at least eight evacuees burned to death in their vehicles, were struggling to mitigate fire spread in almost every instance while failing to prevent evacuation traffic jams. The same day CapRadio revealed the oversight, leaked emails showed that Newsom's handpicked Cal Fire chief had ordered the removal of the original statement. In another report in April 2022, CapRadio found a program, hailed in 2020 by the Newsom administration to fast-track environmental reviews on high-priority fire prevention projects, had failed to make progress.


title: Gavin Newsom

text: KXTV released a series of reports chronicling PG&E's liabilities after committing 91 felonies in the Santa Rosa and Paradise fires. Newsom was accused of accepting campaign donations from PG&E in order to change the CPUC's ruling on PG&E's safety license. The rating change allowed PG&E to avoid billions of dollars in extra fees. Newsom was also accused of setting up the Wildfire Insurance Fund via AB 1054, using ratepayer fees, so PG&E could avoid financial losses and pass the liability costs to ratepayers and taxpayers.


title: Gavin Newsom

text: In September 2019, Newsom vetoed SB 1, which would have preserved environmental protections at the state level that were set to roll back nationally under the Trump administration's environmental policy. In February 2020, the Newsom administration sued federal agencies over the rollbacks to protect imperiled fish in the Sacramento–San Joaquin River Delta in 2019.


title: Gavin Newsom

text: Newsom attended the 2019 UN Climate Action Summit, where he spoke of California as a climate leader due to the actions of governors before him. In August 2020, he addressed the 2020 Democratic National Convention. His speech mentioned climate change and the wildfires prevalent in California at the time. On September 23, 2020, Newsom signed an executive order to phase out sales of gasoline-powered vehicles and require all new passenger vehicles sold in the state to be zero-emission by 2035. Bills he signed in September with an environmental focus included a commission to study lithium extraction around the Salton Sea.


title: Gavin Newsom

text: During his 2018 campaign, Newsom pledged to tighten state oversight of fracking and oil extraction. Early in his governorship, his administration approved new oil and gas leases on public lands at about twice the rate of the prior year. When asked about this development, Newsom said he was unaware of the rate of approvals, and he later fired the head of the Division of Oil, Gas and Geothermal Resources. In November 2019, he imposed a moratorium on approval of new hydraulic fracturing and steam-injected oil drilling in the state until the permits for those projects could be reviewed by an independent panel of scientists. State agencies resumed issuing new hydraulic fracturing permits in April 2020. In 2021, the Center for Biological Diversity sued the Newsom administration over the continued sale of oil and gas leases, and Consumer Watchdog called for the end of their sale. In April 2021, Newsom committed to ending the sale of gas leases by 2024 and ending oil extraction by 2045. In October 2021, he proposed a buffer between new fossil fuel extraction sites and densely populated areas.


title: Gavin Newsom

text: "The Sacramento Bee" reported that Jennifer Siebel Newsom's nonprofit organization The Representation Project had received more than $800,000 in donations from corporations that had lobbied the state government in recent years, including PG&E, AT&T, Comcast, and Kaiser Permanente. Siebel Newsom received $2.3 million in salary from the nonprofit since launching it in 2011. In 2021, Governor Newsom said that he saw no conflict in his wife's nonprofit accepting donations from companies that lobby his administration.


title: Gavin Newsom

text: Overall, Newsom has vetoed legislation at a rate comparable to that of his predecessors. From 2019 to 2021, he vetoed 12.7% of the bills passed by the legislature on average. The rate declined over the course of the three legislative sessions. Newsom's vetoes have included bills to allow ranked-choice voting, require an ethnic studies class as a high school graduation requirement, and reduce penalties for jaywalking.


title: Gavin Newsom

text: As lieutenant governor in 2016, Newsom was the official proponent of Proposition 63. The ballot measure required a background check and California Department of Justice authorization to purchase ammunition, among other gun control regulations. In response to the 2019 mass shooting in Virginia Beach, Newsom called for nationwide background checks on people purchasing ammunition. Later that year, he responded to the Gilroy Garlic Festival shooting by stating his support for the 2nd Amendment and saying he would like national cooperation controlling "weapons of goddamned mass destruction". He also said, "These shootings overwhelmingly, almost exclusively, are males, boys, 'men'—I put in loose quotes. I do think that is missing in the national conversation."


title: Gavin Newsom

text: On June 10, 2021, Newsom called federal Judge Roger Benitez "a stone cold ideologue" and "a wholly owned subsidiary of the gun lobby of the National Rifle Association" after Benitez struck down California's statewide ban on assault weapons. While the ban remained in place as the state appealed the ruling, Newsom proposed legislation that would empower private citizens to enforce the ban after the United States Supreme Court declined to strike down the Texas Heartbeat Act, which empowers private citizens to report unauthorized abortions.


title: Gavin Newsom

text: On July 1, 2022, Newsom signed two gun control bills (AB 1621, 2571) passed by the legislature. Assembly Bill 1621 restricts privately manufactured ghost guns, which were found to be linked to over 100 violent crimes in Los Angeles. Assembly Bill 2571 prohibited the marketing of firearms such as the JR-15 to children.


title: Gavin Newsom

text: On July 22, 2022, Newsom signed Senate Bill 1327, a law enabling private citizens to sue anyone who imports, distributes, manufactures or sells illegal firearms in California. The law requires courts to award statutory damages of at least $10,000 and attorney's fees.


title: Gavin Newsom

text: Newsom campaigned on reducing the cost of health care and increasing access. He also indicated his support for creating a universal state health-care system. The budget passed in June 2019 expanded eligibility for Medi-Cal from solely undocumented minor children to undocumented young adults from ages 19 to 25. In 2021, Newsom signed legislation expanding Medi-Cal eligibility to undocumented residents over age 50. On June 30, 2022, he signed a $307.9 billion state budget that "pledges to make all low-income adults eligible for the state's Medicaid program by 2024 regardless of their immigration status." This budget would make California the first U.S. state to guarantee healthcare to all low-income illegal immigrants, at a cost of $2.7 billion per year.


title: Gavin Newsom

text: In December 2021, Newsom announced his intention to make California a "sanctuary" for abortion, which included possibly paying for procedures, travel, and lodging for out-of-state abortion seekers, if the procedure is banned in Republican-led states. In March 2022, Newsom signed a bill that would require all private health insurance plans in the state to fully cover abortion procedures, by eliminating associated co-pays and deductibles and increasing insurance premiums.


title: Gavin Newsom

text: Newsom was criticized in early 2022 for walking back from his support for universal health care and not supporting Assembly Bill 1400, which would have instituted single-payer health care in California; critics suggested that opposition from business interests, which had donated large sums to Newsom and his party, had swayed his opinion.


title: Gavin Newsom

text: In his February 2019 State of the State address, Newsom announced that, while work would continue on the Central Valley segment from Bakersfield to Merced, the rest of the system would be indefinitely postponed, citing cost overruns and delays. This and other actions created tension with the State Building and Construction Trades Council of California, a labor union representing 450,000 members.


title: Gavin Newsom

text: A poll found that California voters thought the most important issue for Newsom and the state legislature to work on in 2020 was homelessness. In his first week of office, Newsom threatened to withhold state funding for infrastructure to communities that failed to take actions to alleviate California's housing shortage. In late January 2019, he announced that he would sue Huntington Beach for preventing the construction of affordable housing. A year later, the city acted to settle the lawsuit by the state. Newsom opposes NIMBY (not-in-my-back-yard) sentiment, declaring in 2022 that "NIMBYism is destroying the state". In 2021, he signed a pair of bills into law that made zoning regulations for housing less restrictive, allowing construction of duplexes and fourplexes in lots that were previously zoned exclusively for single-family homes. Newsom also signed a bill which expedites the environmental review process for new multifamily developments worth at least $15,000,000. To participate, developers must apply directly through the governor's office.


title: Gavin Newsom

text: In 2022, Newsom signed 39 bills into law intended to address California's housing crisis, three of which entailed major land use reform. One bill eliminated minimum parking requirements for housing near mass transit stations throughout the state. Michael Manville, an urban planning professor at UCLA's Luskin School of Public Affairs, called it "one of the biggest land-use reforms in the country." Another bill allowed developers to build housing on some lots previously exclusively zoned for commercial use without getting local governments' permission if a certain percentage of the housing was affordable. A third bill allowed for the construction of market-rate housing on some lots previously exclusively zoned for commercial use. In a signing ceremony for the latter two bills, Newsom warned local governments, which have a history of blocking and delaying housing developments, that they would be held accountable for future housing obstructionism. Other bills Newsom signed required localities "to approve or deny various building permits within a strict timeline" and streamlined student and faculty housing projects by allowing California colleges to skip onerous review processes for new projects.


title: Gavin Newsom

text: Newsom supports a series of tentative water-sharing agreements that would bring an end to the dispute between farmers, cities, fishers, and environmentalists over how much water should be left in the state's two most important rivers, the Sacramento and San Joaquin, which flow into the Delta.


title: Gavin Newsom

text: In a speech before representatives of Native Americans in June 2019, Newsom apologized for the genocide of Native Americans approved and abetted by the California state government upon statehood in the 19th century. By one estimate, at least 4,500 Native Californians were killed between 1849 and 1870. Newsom said, "That's what it was, a genocide. No other way to describe it. And that's the way it needs to be described in the history books."


title: Gavin Newsom

text: Newsom's first international trip as governor was to El Salvador. With nearly 680,000 Salvadoran immigrants living in California, he said that the "state's relationship with Central America is key to California's future". He was also concerned about the tens of thousands of Salvadorans who were fleeing the smallest country in Central America for the U.S. each year. As governor of a state impacted by the debate of illegal immigration, he went to see the factors driving it firsthand, and to build business and tourism partnerships between California and Central America. He said he wanted to "ignite a more enlightened engagement and dialogue".


title: Gavin Newsom

text: Newsom was baptized and raised in his father's Catholic faith. He has described himself as an "Irish Catholic rebel...in some respects, but one that still has tremendous admiration for the Church and very strong faith". When asked about the state of the Catholic Church in 2008, he said it was in crisis. He said he stays with the Church because of his "strong connection to a greater purpose, and...higher being". Newsom identifies as a practicing Catholic, saying that he has a "strong sense of faith that is perennial, day in and day out". He is the godfather of designer and model Nats Getty.


title: Gavin Newsom

text: In December 2001, Newsom married Kimberly Guilfoyle, a former San Francisco prosecutor and legal commentator for Court TV, CNN, and MSNBC. They married at Saint Ignatius Catholic Church on the campus of the University of San Francisco, where Guilfoyle had attended law school. The couple appeared in the September 2004 issue of "Harper's Bazaar"; the spread had them posed at the Getty Villa with the caption "the New Kennedys". They jointly filed for divorce in January 2005, citing "difficulties due to their careers on opposite coasts". Their divorce was finalized on February 28, 2006. Guilfoyle gained prominence in 2011 via a Fox News chat show. She was later named senior advisor to Republican President Donald Trump, whom Newsom has extensively criticized. Newsom later became an ordained minister with the Universal Life Church.


title: Gavin Newsom

text: On January 31, 2007, Newsom's close friend, campaign manager, and former chief of staff Alex Tourk confronted Newsom after learning from his wife, Ruby Rippey-Tourk, that she and Newsom had an affair in 2005, when she was Newsom's appointments secretary. Tourk immediately resigned. Newsom admitted the affair the next day and apologized to the public, saying he was "deeply sorry" for his "personal lapse of judgment". In 2018, Rippey-Tourk said that she thought it wrong to associate Newsom's behavior with the #MeToo movement: "I was a subordinate, but I was also a free-thinking, 33-yr old adult married woman & mother... I do want to make sure that the #metoo movement is reserved for cases and situations that deserve it."


title: Gavin Newsom

text: Newsom began dating film director Jennifer Siebel in September 2006. He announced he would seek treatment for alcohol use disorder in February 2007. The couple announced their engagement in December 2007, and they were married in Stevensville, Montana, in July 2008. They have four children.


title: Gavin Newsom

text: Newsom and his family moved from San Francisco to a house they bought in Kentfield in Marin County in 2012.


title: Gavin Newsom

text: After his election as governor, Newsom and his family moved into the California Governor's Mansion in Downtown Sacramento and thereafter settled in Fair Oaks. In May 2019, "The Sacramento Bee" reported that Newsom's $3.7 million purchase of a 12,000 square foot home in Fair Oaks was the most expensive private residence sold in the Sacramento region since the year began.


title: Gavin Newsom

text: In August 2021, Newsom sold a Marin County home for $5.9 million in an off-market transaction. He had originally put the property up for sale in early 2019 for $5.895 million, but removed the property from the market after a price reduction to $5.695 million.


title: Aurora

text: An aurora (plural: auroras or aurorae), also commonly known as the polar lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras display dynamic patterns of brilliant lights that appear as curtains, rays, spirals, or dynamic flickers covering the entire sky.


title: Aurora

text: Auroras are the result of disturbances in the magnetosphere caused by the solar wind. Major disturbances result from enhancements in the speed of the solar wind from coronal holes and coronal mass ejections. These disturbances alter the trajectories of charged particles in the magnetospheric plasma. These particles, mainly electrons and protons, precipitate into the upper atmosphere (thermosphere/exosphere). The resulting ionization and excitation of atmospheric constituents emit light of varying colour and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles.


title: Aurora

text: Most of the planets in the Solar System, some natural satellites, brown dwarfs, and even comets also host auroras.


title: Aurora

text: The word "aurora" is derived from the name of the Roman goddess of the dawn, Aurora, who travelled from east to west announcing the coming of the sun. Ancient Greek poets used the corresponding name Eos metaphorically to refer to dawn, often mentioning its play of colors across the otherwise dark sky ("e.g.", "rosy-fingered dawn").


title: Aurora

text: The words "borealis" and "australis" are derived from the names of the ancient gods of the north wind (Boreas) and the south wind (Auster).


title: Aurora

text: Most auroras occur in a band known as the "auroral zone", which is typically 3° to 6° wide in latitude and between 10° and 20° from the geomagnetic poles at all local times (or longitudes), most clearly seen at night against a dark sky. A region that currently displays an aurora is called the "auroral oval", a band displaced by the solar wind towards the night side of Earth. Early evidence for a geomagnetic connection comes from the statistics of auroral observations. Elias Loomis (1860), and later Hermann Fritz (1881) and Sophus Tromholt (1881) in more detail, established that the aurora appeared mainly in the auroral zone.


title: Aurora

text: In northern latitudes, the effect is known as the aurora borealis or the northern lights. The former term was coined by Galileo in 1619, from the Roman goddess of the dawn and the Greek name for the north wind. The southern counterpart, the aurora australis or the southern lights, has features almost identical to the aurora borealis and changes simultaneously with changes in the northern auroral zone. The aurora australis is visible from high southern latitudes in Antarctica, Chile, Argentina, South Africa, New Zealand and Australia. The aurora borealis is visible from being close to the center of the Arctic Circle such as Alaska, the Canadian Territories, Iceland, Greenland, Norway, Sweden, Finland and Russia. On rare occasions the aurora borealis can be seen further south, for example in Estonia, Latvia, Lithuania, Scotland, Ireland, Denmark, and the northern part of the contiguous United States.


title: Aurora

text: A geomagnetic storm causes the auroral ovals (north and south) to expand, bringing the aurora to lower latitudes. The instantaneous distribution of auroras ("auroral oval") is slightly different, being centered about 3–5° nightward of the magnetic pole, so that auroral arcs reach furthest toward the equator when the magnetic pole in question is in between the observer and the Sun. The aurora can be seen best at this time, which is called magnetic midnight.


title: Aurora

text: Auroras seen within the auroral oval may be directly overhead, but from farther away, they illuminate the poleward horizon as a greenish glow, or sometimes a faint red, as if the Sun were rising from an unusual direction. Auroras also occur poleward of the auroral zone as either diffuse patches or arcs, which can be subvisual.


title: Aurora

text: Auroras are occasionally seen in latitudes below the auroral zone, when a geomagnetic storm temporarily enlarges the auroral oval. Large geomagnetic storms are most common during the peak of the 11-year sunspot cycle or during the three years after the peak. An electron spirals (gyrates) about a field line at an angle that is determined by its velocity vectors, parallel and perpendicular, respectively, to the local geomagnetic field vector B. This angle is known as the "pitch angle" of the particle. The distance, or radius, of the electron from the field line at any time is known as its Larmor radius. The pitch angle increases as the electron travels to a region of greater field strength nearer to the atmosphere. Thus, it is possible for some particles to return, or mirror, if the angle becomes 90° before entering the atmosphere to collide with the denser molecules there. Other particles that do not mirror enter the atmosphere and contribute to the auroral display over a range of altitudes. Other types of auroras have been observed from space; for example, "poleward arcs" stretching sunward across the polar cap, the related "theta aurora", and "dayside arcs" near noon. These are relatively infrequent and poorly understood. Other interesting effects occur such as flickering aurora, "black aurora" and subvisual red arcs. In addition to all these, a weak glow (often deep red) observed around the two polar cusps, the field lines separating the ones that close through Earth from those that are swept into the tail and close remotely.


title: Aurora

text: Early work on the imaging of the auroras was done in 1949 by the University of Saskatchewan using the SCR-270 radar. The altitudes where auroral emissions occur were revealed by Carl Størmer and his colleagues, who used cameras to triangulate more than 12,000 auroras. They discovered that most of the light is produced between 90 km (56 mi) and 150 km (93 mi) above the ground, while extending at times to more than 1000 km (620 mi).


title: Aurora

text: According to Clark (2007), there are four main forms that can be seen from the ground, from least to most visible:


title: Aurora

text: Brekke (1994) also described some auroras as "curtains". The similarity to curtains is often enhanced by folds within the arcs. Arcs can fragment or break up into separate, at times rapidly changing, often rayed features that may fill the whole sky. These are also known as "discrete auroras", which are at times bright enough to read a newspaper by at night.


title: Aurora

text: These forms are consistent with auroras being shaped by Earth's magnetic field. The appearances of arcs, rays, curtains, and coronas are determined by the shapes of the luminous parts of the atmosphere and a viewer's position.


title: Aurora

text: Auroras change with time. Over the night, they begin with glows and progress towards coronas, although they may not reach them. They tend to fade in the opposite order. Until about 1963 it was thought that these changes are due to the rotation of the Earth under a pattern fixed with respect to the Sun. Later it was found by comparing all-sky films of auroras from different places (collected during the International Geophysical Year) that they often undergo global changes in a process called auroral substorm. They change in a few minutes from quiet arcs all along the auroral oval to active displays along the darkside and after 1 – 3 hours they gradually change back. Changes in auroras over time are commonly visualized using keograms.


title: Aurora

text: At shorter time scales, auroras can change their appearances and intensity, sometimes so slowly as to be difficult to notice, and at other times rapidly down to the sub-second scale. The phenomenon of pulsating auroras is an example of intensity variations over short timescales, typically with periods of 2–20 seconds. This type of aurora is generally accompanied by decreasing peak emission heights of about 8 km for blue and green emissions and above average solar wind speeds (~ 500 km/s).


title: Aurora

text: In addition, the aurora and associated currents produce a strong radio emission around 150 kHz known as auroral kilometric radiation (AKR), discovered in 1972. Ionospheric absorption makes AKR only observable from space. X-ray emissions, originating from the particles associated with auroras, have also been detected.


title: Aurora

text: Aurora noise, similar to a crackling noise, begins about above Earth's surface and is caused by charged particles in an inversion layer of the atmosphere formed during a cold night. The charged particles discharge when particles from the Sun hit the inversion layer, creating the noise.


title: Aurora

text: In 2016, more than fifty citizen science observations described what was to them an unknown type of aurora which they named "STEVE", for "Strong Thermal Emission Velocity Enhancement". STEVE is not an aurora but is caused by a wide ribbon of hot plasma at an altitude of , with a temperature of and flowing at a speed of (compared to outside the ribbon).


title: Aurora

text: The processes that cause STEVE also are associated with a picket-fence aurora, although the latter can be seen without STEVE. It is an aurora because it is caused by precipitation of electrons in the atmosphere but it appears outside the auroral oval, closer to the equator than typical auroras. When the picket-fence aurora appears with STEVE, it is below.


title: Aurora

text: First reported in 2020 and confirmed in 2021 the dune aurora phenomenon was discovered by Finnish citizen scientists. It consists of regularly-spaced, parallel stripes of brighter emission in the green diffuse aurora which give the impression of sand dunes. The phenomenon is believed to be caused by the modulation of atomic oxygen density by a large-scale atmospheric wave travelling horizontally in a waveguide through an inversion layer in the mesosphere in presence of electron precipitation.


title: Aurora

text: Horse-collar aurora (HCA) are auroral features in which the auroral ellipse shifts poleward during the dawn and dusk portions and the polar cap becomes teardrop-shaped. They form during periods when the interplanetary magnetic field (IMF) is permanently northward, when the IMF clock angle is small. Their formation is associated with the closure of the magnetic flux at the top of the dayside magnetosphere by the double lobe reconnection (DLR). There are approximately 8 HCA events per month, with no seasonal dependence, and that the IMF must be within 30 degrees of northwards.


title: Aurora

text: A full understanding of the physical processes which lead to different types of auroras is still incomplete, but the basic cause involves the interaction of the solar wind with Earth's magnetosphere. The varying intensity of the solar wind produces effects of different magnitudes but includes one or more of the following physical scenarios.


title: Aurora

text: The details of these phenomena are not fully understood. However, it is clear that the prime source of auroral particles is the solar wind feeding the magnetosphere, the reservoir containing the radiation zones and temporarily magnetically-trapped particles confined by the geomagnetic field, coupled with particle acceleration processes.


title: Aurora

text: The immediate cause of the ionization and excitation of atmospheric constituents leading to auroral emissions was discovered in 1960, when a pioneering rocket flight from Fort Churchill in Canada revealed a flux of electrons entering the atmosphere from above. Since then an extensive collection of measurements has been acquired painstakingly and with steadily improving resolution since the 1960s by many research teams using rockets and satellites to traverse the auroral zone. The main findings have been that auroral arcs and other bright forms are due to electrons that have been accelerated during the final few 10,000 km or so of their plunge into the atmosphere. These electrons often, but not always, exhibit a peak in their energy distribution, and are preferentially aligned along the local direction of the magnetic field.


title: Aurora

text: Electrons mainly responsible for diffuse and pulsating auroras have, in contrast, a smoothly falling energy distribution, and an angular (pitch-angle) distribution favouring directions perpendicular to the local magnetic field. Pulsations were discovered to originate at or close to the equatorial crossing point of auroral zone magnetic field lines. Protons are also associated with auroras, both discrete and diffuse.


title: Aurora

text: Auroras result from emissions of photons in Earth's upper atmosphere, above , from ionized nitrogen atoms regaining an electron, and oxygen atoms and nitrogen based molecules returning from an excited state to ground state. They are ionized or excited by the collision of particles precipitated into the atmosphere. Both incoming electrons and protons may be involved. Excitation energy is lost within the atmosphere by the emission of a photon, or by collision with another atom or molecule:


title: Aurora

text: Oxygen is unusual in terms of its return to ground state: it can take 0.7 seconds to emit the 557.7 nm green light and up to two minutes for the red 630.0 nm emission. Collisions with other atoms or molecules absorb the excitation energy and prevent emission, this process is called collisional quenching. Because the highest parts of the atmosphere contain a higher percentage of oxygen and lower particle densities, such collisions are rare enough to allow time for oxygen to emit red light. Collisions become more frequent progressing down into the atmosphere due to increasing density, so that red emissions do not have time to happen, and eventually, even green light emissions are prevented.


title: Aurora

text: This is why there is a color differential with altitude; at high altitudes oxygen red dominates, then oxygen green and nitrogen blue/purple/red, then finally nitrogen blue/purple/red when collisions prevent oxygen from emitting anything. Green is the most common color. Then comes pink, a mixture of light green and red, followed by pure red, then yellow (a mixture of red and green), and finally, pure blue.


title: Aurora

text: Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.


title: Aurora

text: Bright auroras are generally associated with Birkeland currents (Schield et al., 1969; Zmuda and Armstrong, 1973), which flow down into the ionosphere on one side of the pole and out on the other. In between, some of the current connects directly through the ionospheric E layer (125 km); the rest ("region 2") detours, leaving again through field lines closer to the equator and closing through the "partial ring current" carried by magnetically trapped plasma. The ionosphere is an ohmic conductor, so some consider that such currents require a driving voltage, which an, as yet unspecified, dynamo mechanism can supply. Electric field probes in orbit above the polar cap suggest voltages of the order of 40,000 volts, rising up to more than 200,000 volts during intense magnetic storms. In another interpretation, the currents are the direct result of electron acceleration into the atmosphere by wave/particle interactions.


title: Aurora

text: Ionospheric resistance has a complex nature, and leads to a secondary Hall current flow. By a strange twist of physics, the magnetic disturbance on the ground due to the main current almost cancels out, so most of the observed effect of auroras is due to a secondary current, the auroral electrojet. An auroral electrojet index (measured in nanotesla) is regularly derived from ground data and serves as a general measure of auroral activity. Kristian Birkeland deduced that the currents flowed in the east–west directions along the auroral arc, and such currents, flowing from the dayside toward (approximately) midnight were later named "auroral electrojets" (see also Birkeland currents).


title: Aurora

text: Earth is constantly immersed in the solar wind, a flow of magnetized hot plasma (a gas of free electrons and positive ions) emitted by the Sun in all directions, a result of the two-million-degree temperature of the Sun's outermost layer, the corona. The solar wind reaches Earth with a velocity typically around 400 km/s, a density of around 5 ions/cm and a magnetic field intensity of around 2–5 nT (for comparison, Earth's surface field is typically 30,000–50,000 nT). During magnetic storms, in particular, flows can be several times faster; the interplanetary magnetic field (IMF) may also be much stronger. Joan Feynman deduced in the 1970s that the long-term averages of solar wind speed correlated with geomagnetic activity. Her work resulted from data collected by the Explorer 33 spacecraft.


title: Aurora

text: The solar wind and magnetosphere consist of plasma (ionized gas), which conducts electricity. It is well known (since Michael Faraday's work around 1830) that when an electrical conductor is placed within a magnetic field while relative motion occurs in a direction that the conductor cuts "across" (or is cut "by"), rather than "along", the lines of the magnetic field, an electric current is induced within the conductor. The strength of the current depends on a) the rate of relative motion, b) the strength of the magnetic field, c) the number of conductors ganged together and d) the distance between the conductor and the magnetic field, while the "direction" of flow is dependent upon the direction of relative motion. Dynamos make use of this basic process ("the dynamo effect"), any and all conductors, solid or otherwise are so affected, including plasmas and other fluids.


title: Aurora

text: The IMF originates on the Sun, linked to the sunspots, and its field lines (lines of force) are dragged out by the solar wind. That alone would tend to line them up in the Sun-Earth direction, but the rotation of the Sun angles them at Earth by about 45 degrees forming a spiral in the ecliptic plane, known as the Parker spiral. The field lines passing Earth are therefore usually linked to those near the western edge ("limb") of the visible Sun at any time.


title: Aurora

text: The solar wind and the magnetosphere, being two electrically conducting fluids in relative motion, should be able in principle to generate electric currents by dynamo action and impart energy from the flow of the solar wind. However, this process is hampered by the fact that plasmas conduct readily along magnetic field lines, but less readily perpendicular to them. Energy is more effectively transferred by the temporary magnetic connection between the field lines of the solar wind and those of the magnetosphere. Unsurprisingly this process is known as magnetic reconnection. As already mentioned, it happens most readily when the interplanetary field is directed southward, in a similar direction to the geomagnetic field in the inner regions of both the north magnetic pole and south magnetic pole.


title: Aurora

text: Auroras are more frequent and brighter during the intense phase of the solar cycle when coronal mass ejections increase the intensity of the solar wind.


title: Aurora

text: Earth's magnetosphere is shaped by the impact of the solar wind on Earth's magnetic field. This forms an obstacle to the flow, diverting it, at an average distance of about 70,000 km (11 Earth radii or Re), producing a bow shock 12,000 km to 15,000 km (1.9 to 2.4 Re) further upstream. The width of the magnetosphere abreast of Earth is typically 190,000 km (30 Re), and on the night side a long "magnetotail" of stretched field lines extends to great distances (> 200 Re).


title: Aurora

text: The high latitude magnetosphere is filled with plasma as the solar wind passes Earth. The flow of plasma into the magnetosphere increases with additional turbulence, density, and speed in the solar wind. This flow is favored by a southward component of the IMF, which can then directly connect to the high latitude geomagnetic field lines. The flow pattern of magnetospheric plasma is mainly from the magnetotail toward Earth, around Earth and back into the solar wind through the magnetopause on the day-side. In addition to moving perpendicular to Earth's magnetic field, some magnetospheric plasma travels down along Earth's magnetic field lines, gains additional energy and loses it to the atmosphere in the auroral zones. The cusps of the magnetosphere, separating geomagnetic field lines that close through Earth from those that close remotely allow a small amount of solar wind to directly reach the top of the atmosphere, producing an auroral glow.


title: Aurora

text: On 26 February 2008, THEMIS probes were able to determine, for the first time, the triggering event for the onset of magnetospheric substorms. Two of the five probes, positioned approximately one third the distance to the Moon, measured events suggesting a magnetic reconnection event 96 seconds prior to auroral intensification.


title: Aurora

text: Geomagnetic storms that ignite auroras may occur more often during the months around the equinoxes. It is not well understood, but geomagnetic storms may vary with Earth's seasons. Two factors to consider are the tilt of both the solar and Earth's axis to the ecliptic plane. As Earth orbits throughout a year, it experiences an interplanetary magnetic field (IMF) from different latitudes of the Sun, which is tilted at 8 degrees. Similarly, the 23-degree tilt of Earth's axis about which the geomagnetic pole rotates with a diurnal variation changes the daily average angle that the geomagnetic field presents to the incident IMF throughout a year. These factors combined can lead to minor cyclical changes in the detailed way that the IMF links to the magnetosphere. In turn, this affects the average probability of opening a door through which energy from the solar wind can reach Earth's inner magnetosphere and thereby enhance auroras. Recent evidence in 2021 has shown that individual separate substorms may in fact be correlated networked communities.


title: Aurora

text: Just as there are many types of aurora, there are many different mechanisms that accelerate auroral particles into the atmosphere. Electron aurora in Earth's auroral zone (i.e. commonly visible aurora) can be split into two main categories with different immediate causes: diffuse and discrete aurora. Diffuse aurora appear relatively structureless to an observer on the ground, with indistinct edges and amorphous forms. Discrete aurora are structured into distinct features with well-defined edges such as arcs, rays and coronas; they also tend to be much brighter than the diffuse aurora.


title: Aurora

text: In both cases, the electrons that eventually cause the aurora start out as electrons trapped by the magnetic field in Earth's magnetosphere. These trapped particles bounce back and forth along magnetic field lines and are prevented from hitting the atmosphere by the magnetic mirror formed by the increasing magnetic field strength closer to Earth. The magnetic mirror's ability to trap a particle depends on the particle's pitch angle: the angle between its direction of motion and the local magnetic field. An aurora is created by processes that decrease the pitch angle of many individual electrons, freeing them from the magnetic trap and causing them to hit the atmosphere.


title: Aurora

text: In the case of diffuse auroras, the electron pitch angles are altered by their interaction with various plasma waves. Each interaction is essentially wave-particle scattering; the electron energy after interacting with the wave is similar to its energy before interaction, but the direction of motion is altered. If the final direction of motion after scattering is close to the field line (specifically, if it falls within the loss cone) then the electron will hit the atmosphere. Diffuse auroras are caused by the collective effect of many such scattered electrons hitting the atmosphere. The process is mediated by the plasma waves, which become stronger during periods of high geomagnetic activity, leading to increased diffuse aurora at those times.


title: Aurora

text: In the case of discrete auroras, the trapped electrons are accelerated toward Earth by electric fields that form at an altitude of about 4000–12000 km in the "auroral acceleration region". The electric fields point away from Earth (i.e. upward) along the magnetic field line. Electrons moving downward through these fields gain a substantial amount of energy (on the order of a few keV) in the direction along the magnetic field line toward Earth. This field-aligned acceleration decreases the pitch angle for all of the electrons passing through the region, causing many of them to hit the upper atmosphere. In contrast to the scattering process leading to diffuse auroras, the electric field increases the kinetic energy of all of the electrons transiting downward through the acceleration region by the same amount. This accelerates electrons starting from the magnetosphere with initially low energies (10s of eV or less) to energies required to create an aurora (100s of eV or greater), allowing that large source of particles to contribute to creating auroral light.


title: Aurora

text: The accelerated electrons carry an electric current along the magnetic field lines (a Birkeland current). Since the electric field points in the same direction as the current, there is a net conversion of electromagnetic energy into particle energy in the auroral acceleration region (an electric load). The energy to power this load is eventually supplied by the magnetized solar wind flowing around the obstacle of Earth's magnetic field, although exactly how that power flows through the magnetosphere is still an active area of research. While the energy to power the aurora is ultimately derived from the solar wind, the electrons themselves do not travel directly from the solar wind into Earth's auroral zone; magnetic field lines from these regions do not connect to the solar wind, so there is no direct access for solar wind electrons.


title: Aurora

text: Some auroral features are also created by electrons accelerated by Alfvén waves. At small wavelengths (comparable to the electron inertial length or ion gyroradius), Alfvén waves develop a significant electric field parallel to the background magnetic field; this can accelerate electrons due to a process of Landau damping. If the electrons have a speed close to that of the wave's phase velocity, they are accelerated in a manner analogous to a surfer catching an ocean wave. This constantly-changing wave electric field can accelerate electrons along the field line, causing some of them to hit the atmosphere. Electrons accelerated by this mechanism tend to have a broad energy spectrum, in contrast to the sharply-peaked energy spectrum typical of electrons accelerated by quasi-static electric fields.


title: Aurora

text: In addition to the discrete and diffuse electron aurora, proton aurora is caused when magnetospheric protons collide with the upper atmosphere. The proton gains an electron in the interaction, and the resulting neutral hydrogen atom emits photons. The resulting light is too dim to be seen with the naked eye. Other aurora not covered by the above discussion include transpolar arcs (formed poleward of the auroral zone), cusp aurora (formed in two small high-latitude areas on the dayside) and some non-terrestrial auroras.


title: Aurora

text: The discovery of a 1770 Japanese diary in 2017 depicting auroras above the ancient Japanese capital of Kyoto suggested that the storm may have been 7% larger than the Carrington event, which affected telegraph networks.


title: Aurora

text: The auroras that resulted from the "great geomagnetic storm" on both 28 August and 2 September 1859, however, are thought to be the most spectacular in recent recorded history. In a paper to the Royal Society on 21 November 1861, Balfour Stewart described both auroral events as documented by a self-recording magnetograph at the Kew Observatory and established the connection between the 2 September 1859 auroral storm and the Carrington–Hodgson flare event when he observed that "It is not impossible to suppose that in this case our luminary was taken "in the act"." The second auroral event, which occurred on 2 September 1859, was a result of the (unseen) coronal mass ejection associated with the exceptionally intense Carrington–Hodgson white light solar flare on 1 September 1859. This event produced auroras so widespread and extraordinarily bright that they were seen and reported in published scientific measurements, ship logs, and newspapers throughout the United States, Europe, Japan, and Australia. It was reported by "The New York Times" that in Boston on Friday 2 September 1859 the aurora was "so brilliant that at about one o'clock ordinary print could be read by the light". One o'clock EST time on Friday 2 September would have been 6:00 GMT; the self-recording magnetograph at the Kew Observatory was recording the geomagnetic storm, which was then one hour old, at its full intensity. Between 1859 and 1862, Elias Loomis published a series of nine papers on the Great Auroral Exhibition of 1859 in the "American Journal of Science" where he collected worldwide reports of the auroral event.


title: Aurora

text: That aurora is thought to have been produced by one of the most intense coronal mass ejections in history. It is also notable for the fact that it is the first time where the phenomena of auroral activity and electricity were unambiguously linked. This insight was made possible not only due to scientific magnetometer measurements of the era, but also as a result of a significant portion of the of telegraph lines then in service being significantly disrupted for many hours throughout the storm. Some telegraph lines, however, seem to have been of the appropriate length and orientation to produce a sufficient geomagnetically induced current from the electromagnetic field to allow for continued communication with the telegraph operator power supplies switched off. The following conversation occurred between two operators of the American Telegraph Line between Boston and Portland, Maine, on the night of 2 September 1859 and reported in the "Boston Traveler":


title: Aurora

text: The conversation was carried on for around two hours using no battery power at all and working solely with the current induced by the aurora, and it was said that this was the first time on record that more than a word or two was transmitted in such manner. Such events led to the general conclusion that


title: Aurora

text: The earliest datable record of an aurora was recorded in the "Bamboo Annals", a historical chronicle of the history of ancient China, on 977 or 957 BCE.


title: Aurora

text: An aurora was described by the Greek explorer Pytheas in the 4th century BC. Seneca wrote about auroras in the first book of his "Naturales Quaestiones", classifying them, for instance as "pithaei" ('barrel-like'); "chasmata" ('chasm'); "pogoniae" ('bearded'); "cyparissae" ('like cypress trees'), and describing their manifold colors. He wrote about whether they were above or below the clouds, and recalled that under Tiberius, an aurora formed above the port city of Ostia that was so intense and red that a cohort of the army, stationed nearby for fire duty, galloped to the rescue. It has been suggested that Pliny the Elder depicted the aurora borealis in his "Natural History", when he refers to "trabes", "chasma", 'falling red flames' and 'daylight in the night'.


title: Aurora

text: The oldest known written record of the aurora was in a Chinese legend written around 2600 BC. On an autumn around 2000 BC, according to a legend, a young woman named Fubao was sitting alone in the wilderness by a bay, when suddenly a "magical band of light" appeared like "moving clouds and flowing water", turning into a bright halo around the Big Dipper, which cascaded a pale silver brilliance, illuminating the earth and making shapes and shadows seem alive. Moved by this sight, Fubao became pregnant and gave birth to a son, the Emperor Xuanyuan, known legendarily as the initiator of Chinese culture and the ancestor of all Chinese people. In the "Shanhaijing", a creature named 'Shilong' is described to be like a red dragon shining in the night sky with a body a thousand miles long. In ancient times, the Chinese did not have a fixed word for the aurora, so it was named according to the different shapes of the aurora, such as "Sky Dog ("天狗")", "Sword/Knife Star ("刀星")", "Chiyou banner ("蚩尤旗")", "Sky's Open Eyes ("天开眼")", and "Stars like Rain ("星陨如雨")".


title: Aurora

text: In Japanese folklore, pheasants were considered messengers from heaven. However, researchers from Japan's Graduate University for Advanced Studies and National Institute of Polar Research claimed in March 2020 that red pheasant tails witnessed across the night sky over Japan in 620 A.D., might be a red aurora produced during a magnetic storm.


title: Aurora

text: In the traditions of Aboriginal Australians, the Aurora Australis is commonly associated with fire. For example, the Gunditjmara people of western Victoria called auroras "puae buae" ('ashes'), while the Gunai people of eastern Victoria perceived auroras as bushfires in the spirit world. The Dieri people of South Australia say that an auroral display is "kootchee", an evil spirit creating a large fire. Similarly, the Ngarrindjeri people of South Australia refer to auroras seen over Kangaroo Island as the campfires of spirits in the 'Land of the Dead'. Aboriginal people in southwest Queensland believe the auroras to be the fires of the "Oola Pikka", ghostly spirits who spoke to the people through auroras. Sacred law forbade anyone except male elders from watching or interpreting the messages of ancestors they believed were transmitted through an aurora.


title: Aurora

text: Among the Māori people of New Zealand, aurora australis or "Tahunui-a-rangi" ("great torches in the sky") were alight by ancestors who sailed south to a "land of ice" (or their descendants); said people were said to be Ui-te-Rangiora's expedition party who had reached the Antarctic Southern Ocean around the 7th century.


title: Aurora

text: In Scandinavia, the first mention of "norðrljós" (the northern lights) is found in the Norwegian chronicle "Konungs Skuggsjá" from AD 1230. The chronicler has heard about this phenomenon from compatriots returning from Greenland, and he gives three possible explanations: that the ocean was surrounded by vast fires; that the sun flares could reach around the world to its night side; or that glaciers could store energy so that they eventually became fluorescent.


title: Aurora

text: Walter William Bryant wrote in his book (1920) that Tycho Brahe "seems to have been something of a homœopathist, for he recommends sulfur to cure infectious diseases 'brought on by the sulphurous vapours of the Aurora Borealis.


title: Aurora

text: In 1778, Benjamin Franklin theorized in his paper "Aurora Borealis, Suppositions and Conjectures towards forming an Hypothesis for its Explanation" that an aurora was caused by a concentration of electrical charge in the polar regions intensified by the snow and moisture in the air:


title: Aurora

text: Observations of the rhythmic movement of compass needles due to the influence of an aurora were confirmed in the Swedish city of Uppsala by Anders Celsius and Olof Hiorter. In 1741, Hiorter was able to link large magnetic fluctuations with an aurora being observed overhead. This evidence helped to support their theory that 'magnetic storms' are responsible for such compass fluctuations.


title: Aurora

text: A variety of Native American myths surround the spectacle. The European explorer Samuel Hearne traveled with Chipewyan Dene in 1771 and recorded their views on the "ed-thin" ('caribou'). According to Hearne, the Dene people saw the resemblance between an aurora and the sparks produced when caribou fur is stroked. They believed that the lights were the spirits of their departed friends dancing in the sky, and when they shone brightly it meant that their deceased friends were very happy.


title: Aurora

text: During the night after the Battle of Fredericksburg, an aurora was seen from the battlefield. The Confederate Army took this as a sign that God was on their side, as the lights were rarely seen so far south. The painting "Aurora Borealis" by Frederic Edwin Church is widely interpreted to represent the conflict of the American Civil War.


title: Aurora

text: A mid 19th-century British source says auroras were a rare occurrence before the 18th century. It quotes Halley as saying that before the aurora of 1716, no such phenomenon had been recorded for more than 80 years, and none of any consequence since 1574. It says no appearance is recorded in the "Transactions of the French Academy of Sciences" between 1666 and 1716. And that one aurora recorded in "Berlin Miscellany" for 1797 was called a very rare event. One observed in 1723 at Bologna was stated to be the first ever seen there. Celsius (1733) states the oldest residents of Uppsala thought the phenomenon a great rarity before 1716. The period between approximately 1645 to 1715 corresponds to the Maunder minimum in sunspot activity.


title: Aurora

text: In Robert W. Service's satirical poem "" (1908) a Yukon prospector discovers that the aurora is the glow from a radium mine. He stakes his claim, then goes to town looking for investors.


title: Aurora

text: In the early 1900s, the Norwegian scientist Kristian Birkeland laid the foundation for current understanding of geomagnetism and polar auroras.


title: Aurora

text: In Sami mythology the northern lights are caused by the deceased who bled to death cutting themselves, their blood spilling on the sky, many aborigine peoples of northern Eurasia and North-America share similar beliefs of northern lights being the blood of the deceased, some believing they are caused by dead warriors' blood spraying on the sky as they engage in playing games, riding horses or having fun in some other way.


title: Aurora

text: Both Jupiter and Saturn have magnetic fields that are stronger than Earth's (Jupiter's equatorial field strength is 4.3 Gauss, compared to 0.3 Gauss for Earth), and both have extensive radiation belts. Auroras have been observed on both gas planets, most clearly using the Hubble Space Telescope, and the "Cassini" and "Galileo" spacecraft, as well as on Uranus and Neptune.


title: Aurora

text: The aurorae on Saturn seem, like Earth's, to be powered by the solar wind. However, Jupiter's aurorae are more complex. Jupiter's main auroral oval is associated with the plasma produced by the volcanic moon Io, and the transport of this plasma within the planet's magnetosphere. An uncertain fraction of Jupiter's aurorae are powered by the solar wind. In addition, the moons, especially Io, are also powerful sources of aurora. These arise from electric currents along field lines ("field aligned currents"), generated by a dynamo mechanism due to the relative motion between the rotating planet and the moving moon. Io, which has active volcanism and an ionosphere, is a particularly strong source, and its currents also generate radio emissions, which have been studied since 1955. Using the Hubble Space Telescope, auroras over Io, Europa and Ganymede have all been observed.


title: Aurora

text: Auroras have also been observed on Venus and Mars. Venus has no magnetic field and so Venusian auroras appear as bright and diffuse patches of varying shape and intensity, sometimes distributed over the full disc of the planet. A Venusian aurora originates when electrons from the solar wind collide with the night-side atmosphere.


title: Aurora

text: An aurora was detected on Mars, on 14 August 2004, by the SPICAM instrument aboard Mars Express. The aurora was located at Terra Cimmeria, in the region of 177° East, 52° South. The total size of the emission region was about 30 km across, and possibly about 8 km high. By analyzing a map of crustal magnetic anomalies compiled with data from Mars Global Surveyor, scientists observed that the region of the emissions corresponded to an area where the strongest magnetic field is localized. This correlation indicated that the origin of the light emission was a flux of electrons moving along the crust magnetic lines and exciting the upper atmosphere of Mars.


title: Aurora

text: Between 2014 and 2016, cometary auroras were observed on comet 67P/Churyumov–Gerasimenko by multiple instruments on the Rosetta spacecraft. The auroras were observed at far-ultraviolet wavelengths. Coma observations revealed atomic emissions of hydrogen and oxygen caused by the photodissociation (not photoionization, like in terrestrial auroras) of water molecules in the comet's coma. The interaction of accelerated electrons from the solar wind with gas particles in the coma is responsible for the aurora. Since comet 67P has no magnetic field, the aurora is diffusely spread around the comet.


title: Aurora

text: Exoplanets, such as hot Jupiters, have been suggested to experience ionization in their upper atmospheres and generate an aurora modified by weather in their turbulent tropospheres. However, there is no current detection of an exoplanet aurora.


title: Aurora

text: The first ever extra-solar auroras were discovered in July 2015 over the brown dwarf star LSR J1835+3259. The mainly red aurora was found to be a million times brighter than the Northern Lights, a result of the charged particles interacting with hydrogen in the atmosphere. It has been speculated that stellar winds may be stripping off material from the surface of the brown dwarf to produce their own electrons. Another possible explanation for the auroras is that an as-yet-undetected body around the dwarf star is throwing off material, as is the case with Jupiter and its moon Io.


title: Leopard 2

text: The Leopard 2 is a 3rd generation main battle tank originally developed by Krauss-Maffei in the 1970s for the West German army. The tank first entered service in 1979 and succeeded the earlier Leopard 1 as the main battle tank of the West German Army. It is armed with a 120 mm smoothbore cannon, and is powered by a V-12 twin-turbo diesel engine. Various versions have served in the armed forces of Germany and 13 other European countries, as well as several non-European nations, including Canada, Chile, Indonesia, and Singapore. The Leopard 2 was used in Kosovo with the German Army, in Afghanistan with the Dutch, Danish and Canadian contributions to the International Security Assistance Force, and saw action in Syria with the Turkish Armed Forces.


title: Leopard 2

text: There are two main development batches of the tank: the original models up to Leopard 2A4, which have vertically faced turret armour, and the improved batch, namely the Leopard 2A5 and newer versions, which have angled arrow-shaped turret appliqué armour together with other improvements. All models feature digital fire control systems with laser rangefinders, a fully stabilised main gun and coaxial machine gun, and advanced night vision and sighting equipment (first vehicles used a low-light level TV system or LLLTV; thermal imaging was introduced later on). The tank has the ability to engage moving targets while moving over rough terrain.


title: Leopard 2

text: Even as the Leopard 1 was just entering service, the West German military was interested in producing an improved tank in the next decade. This resulted in the start of the MBT-70 development in cooperation with the United States beginning in 1963. However already in 1967 it became questionable whether the MBT-70 would enter service at any time in the foreseeable future. Therefore, the German government issued the order to research future upgrade options of the Leopard 1 to the German company Porsche in 1967.


title: Leopard 2

text: This study was named "vergoldeter Leopard" (Gilded Leopard) and focused on incorporating advanced technology into the Leopard design. The projected upgrades added an autoloader, a coaxial autocannon and an independent commander's periscope. The anti-air machine gun could be operated from inside the vehicle and a TV surveillance camera was mounted on an extendable mast. The shape of the turret and hull was optimised using cast steel armour, while the suspension, transmission and the engine exhaust vents were improved.


title: Leopard 2

text: Following the end of the Gilded Leopard study in 1967, the West-German government decided to focus on the "Experimentalentwicklung" (experimental development) in a feasibility study and to develop new components for upgrading the Leopard 1 and for use on a future main battle tank programme. At first 25 million DM were invested, but after the industry came to the conclusion that with such a low budget the development of the two projected testbeds was not possible, a total of 30 to 32 million DM was invested. The experimental development was contracted to the company Krauss-Maffei, but with the obligation to cooperate with Porsche for the development of the chassis and with Wegmann for the development of the turret.


title: Leopard 2

text: Two prototypes with differing components were built with the aim to improve the conception of the Leopard 1 in such a way that it would match the firepower requirements of the MBT-70. A high first-hit probability at ranges of and the ability to accurately engage targets on the move using a computerised fire control system were the main goals of the experimental development. The resulting vehicles were nicknamed "Keiler" ("tusker"). Two prototypes (ET 01 and ET 02) of the Keiler were built in 1969 and 1970, both of them being powered by the MB 872 engine.


title: Leopard 2

text: The MBT-70 was a revolutionary design, but after large cost overruns and technological problems, Germany withdrew from the project in 1969. After unsuccessful attempts of saving the MBT-70 by conceptual changes in order to eliminate the biggest issue—the driver being seated in the turret—it became clear in late 1969 that Germany would stop the bi-national development. The assistant secretary of the military procurement division of the German Ministry of Defence suggested reusing as much technologies developed for the MBT-70 as possible in a further programme, which was nicknamed "Eber" ("boar") due to his being named Eberhardt. The "Eber" used a modified MBT-70 turret and hull, with the driver being seated in the hull. Only a wooden mock-up was made.


title: Leopard 2

text: One year later, a choice was made to continue the development based on the earlier "Keiler" project of the late 1960s, instead of finishing the development of the "Eber". In 1971, the name of the design was determined as "Leopard 2" with the original Leopard retroactively becoming the Leopard 1, and Paul-Werner Krapke became the project officer of the Leopard 2 program. Originally two versions were projected: the gun-armed Leopard 2K and the Leopard 2FK, which would be armed with the XM150 gun/launcher weapon of the MBT-70.


title: Leopard 2

text: In 1971 17 prototypes were ordered, but only 16 hulls were built as the production of hull PT12 was cancelled. Ten were ordered initially before another seven were ordered. The 17 turrets were designated T1 to T17, and the hulls were designated PT1 to PT11 and PT13 to PT17. To test a larger number of components and concepts, each prototype was fitted with components not found on the other prototypes. Ten of the turrets were equipped with 105 mm smoothbore guns, and the other seven prototypes were equipped with a 120 mm smoothbore gun.


title: Leopard 2

text: Hulls PT11 and PT17 were fitted with a hydropneumatic suspension based on the MBT-70 design. The running gears of these two hulls had only six road wheels. Different types of APUs were mounted in the prototypes. All turrets were equipped with a machine gun for air defence except the turret mounted on PT11, where a 20 mm remotely operated autocannon was mounted. With the exception of hulls PT07, PT09, PT15 and PT17, all prototypes used the MB 873 engine. The road wheels were taken from the MBT-70 and the return rollers from the Leopard 1. The prototypes were designed with a projected weight of MLC50, which equals approximately . The welded turret utilised spaced armour formed by two steel plates. The prototypes were equipped with an EMES-12 optical rangefinder and fire control system, which later was adopted on the Leopard 1A4.


title: Leopard 2

text: In mid-1973 a new turret was designed by Wegmann saving weight. It was nicknamed the "Spitzmaus-Turm" (shrew turret) due to the highly sloped front. This design was only possible with the new EMES-13 optical rangefinder, which required a base length of only instead of the previous . Based on experiences in the Yom Kippur War, a higher level of protection than the prototypes' heavily sloped spaced armour was demanded in late 1973 and the Spitzmaus-Turm was never produced.


title: Leopard 2

text: The weight limit was increased from MLC50 to MLC60, which equals approximately . The turret T14 was modified to test a new armour configuration, taking on a blockier-looking appearance as a result of using vertical modules of spaced multilayer armour. It was also used to test the new EMES-13 optical rangefinder. The modified turret T14 was designated "T14 mod". and was fitted with a fully electric turret drive and stabilization system, which was developed together by the companies General Electric and AEG Telefunken.


title: Leopard 2

text: In July 1973 German Federal Minister of Defence Georg Leber and his US counterpart James R. Schlesinger agreed upon a higher degree of standardization in main battle tanks being favourable to NATO. By integrating components already fully developed by German companies for the Leopard 2, the costs of the XM1 Abrams, U.S. prototype tank developed after the MBT-70, should be reduced. A German commission was sent to the US to evaluate the harmonisation of components between the XM1 and Leopard 2. However, by American law it was not possible for a public bidder to interfere in a procurement tender after a contract with intention of profits and deadline was awarded to companies of the private industry.


title: Leopard 2

text: As a result, the modification of the Leopard 2 prototypes in order to meet the US Army requirements was investigated. Following a number of further talks, a memorandum of understanding (MOU) was signed on 11 December 1974 between the Germany and the US, which declared that a modified version of the Leopard 2 should be trialled by the US against their XM1 prototypes, after the Americans had bought and investigated prototype PT07 in 1973. The MOU obligated the Federal Republic of Germany to send a complete prototype, a hull, a vehicle for ballistic tests and a number of special ballistic parts to the US, where they would be put through US testing procedures for no additional costs.


title: Leopard 2

text: The Leopard 2AV ("austere version") was based on the experiences of the previous Leopard 2 development. It was created in order to meet the US requirements and the latest protection requirements of the German MoD. The turret T14 mod was used as the base for the Leopard 2AV's turret, but meeting the required level of protection for the hull required several attempts until the final ballistic trials on 23 to 26 June 1976. Following the US' preference of laser rangefinders, the turret of prototype PT19 was fitted with a laser rangefinder developed together with the American company Hughes.


title: Leopard 2

text: In comparison with the earlier Leopard 2 prototypes, the fire control system was simplified by replacing the EMES-12 optical rangefinder and removing the crosswind sensor, the air-pressure and temperature sensors, the powder temperature sensor, the PERI R12 commander sight with IR searchlight, the short-range grenade launcher for use against infantry, the retractable search-light, the spotlight, the retractable passive night vision sight, the APU and the mechanical loading assistant.