Image Credit: 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 from the last solar cycle 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 thought to be related to
the rapidly changing magnetic
field loops that channel solar plasma. Large sunspot
group AR 9169 moved across the Sun during 2000
September and decayed in a few weeks.
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