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The h-index, created by Jorge E. Hirsch in 2005, is an attempt to measure the research impact of a scholar. In his 2005 article Hirsch put forward an easily computable index, h, which gives an estimate of the importance, significance, and broad impact of a scientist's cumulative research contributions..
H-alpha (HÎ±) is a specific deep-red visible spectral line in the Balmer series created by hydrogen with a wavelength of 656.28 nm, which occurs when a hydrogen electron falls from its third to second lowest energy level.herefore, the H-alpha line occurs where hydrogen is being ionized. The H-alpha line saturates (self-absorbs) relatively easily because hydrogen is the primary component of nebulae, so while it can indicate the shape and extent of the cloud, it cannot be used to accurately determine the cloud's mass.