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 thought 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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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: TRACE - sunspot - ultraviolet - Solnechnye pyatna - Ul'trafioletovoe izluchenie Publikacii so slovami: TRACE - sunspot - ultraviolet - Solnechnye pyatna - Ul'trafioletovoe izluchenie
Sm. takzhe: AR 3664 na zahodyashem Solnce AR 3664: gigantskaya gruppa solnechnyh pyaten Pyatna na aktivnom Solnce Solnechnoe pyatno so svetlym mostom Holm solnechnyh pyaten Galaktika Andromedy v ul'trafioletovom svete AR2835: ostrova v fotosfere Vse publikacii na tu zhe temu >>