 Above the level of the photosphere is the stellar atmosphere . In a main sequence star such as the Sun , the lowest level of the atmosphere , just above the photosphere , is the thin chromosphere region , where spicules appear and stellar flares begin . Above this is the transition region , where the temperature rapidly increases within a distance of only 100 km ( 62 mi ) . Beyond this is the corona , a volume of super @-@ heated plasma that can extend outward to several million kilometres . The existence of a corona appears to be dependent on a convective zone in the outer layers of the star . Despite its high temperature , and the corona emits very little light , due to its low gas density . The corona region of the Sun is normally only visible during a solar eclipse . 
 Above the level of the photosphere <a href='drop_aux' title='1'><mark>is</mark></a>the stellar atmosphere . In a main sequence star such as the Sun , the lowest level of the atmosphere , just above the photosphere , <a href='drop_aux' title='2'><mark>is</mark></a>the thin chromosphere region , where spicules appear and stellar flares begin . Above this is the transition region , where the temperature rapidly <a href='uninflect' title='3'><mark>increases</mark></a> within a distance of only 100 km ( 62 mi ) . Beyond this <a href='drop_aux' title='4'><mark>is</mark></a>the corona , a volume of super @-@ heated plasma <a href='null_relcl' title='5'><mark>that</mark></a>can extend outward to several million kilometres . The existence of a corona <a href='uninflect' title='6'><mark>appears</mark></a> to be dependent on a convective zone in the outer layers of the star . Despite its high temperature , and the corona <a href='uninflect' title='7'><mark>emits</mark></a> very little light , due to its low gas density . The corona region of the Sun <a href='drop_aux' title='8'><mark>is</mark></a>normally only visible during a solar eclipse . 
Above the level of the photosphere the stellar atmosphere . In a main sequence star such as da Sun , the lowest level of the atmosphere , just above tdaphotosphere , the thin chromosphere region , where spicules appear and stellar flares begin . Above dis is the transition region , where the temperature rapidly increase within a distance of only 100 km ( 62 mi ) . Beyond tdisthe corona , a volume of super @-@ heated plasma can extend outward to several million kilometres . The existence of a corona appear to be dependent on a convective zone in the outer layers of thdatar . Despite its high temperature , and the corona emit very lil light , due to its low gas density . The corona region of the Sun normally only visible during a solar eclipse .