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Credit & Copyright: TRACE Project,
NASA
Explanation:
It was a quiet day on the
Sun.
The above image shows, however, that even during off days the
Sun's surface is a busy place.
Shown in ultraviolet light, the relatively
cool dark regions have temperatures of thousands of degrees
Celsius.
Large sunspot group AR 9169 is
visible as the bright area near the horizon.
The bright glowing gas flowing around the
sunspots
has a temperature of over one million degrees
Celsius.
The reason for the high temperatures is
unknown
but though to be related to the rapidly changing
magnetic field loops that channel solar plasma.
Sunspot group AR 9169
moved across the Sun during 2000 September and
decayed in a few weeks.
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: TRACE - sunspot - ultraviolet
Publications with words: TRACE - sunspot - ultraviolet
See also: