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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