Image:Sunspot TRACE.jpeg

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Original NASA description:

It was a quiet day on the Sun in September of 2000. The above image from NASA's sun-observing TRACE spacecraft 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.

A large sunspot group 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 (1.8 million degrees Fahrenheit). The high temperatures are thought to be related to the rapidly changing magnetic field loops that channel solar plasma.

Photo Credit: NASA/TRACE. (Public domain)

Source: http://antwrp.gsfc.nasa.gov/apod/ap020508.html

[edit] Licensing

Public domain
 This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

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File history

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Date/TimeDimensionsUserComment
current10:12, 21 October 2006898×737 (440 KB)Conscious (high-res)
07:59, 16 May 2005731×600 (60 KB)Xgarciaf (Original NASA description: ''It was a quiet day on the Sun in September of 2000. The above image from NASA's sun-observing TRACE spacecraft shows, however, that even during "off days" the Sun's surface is a busy place. Shown in ultraviolet light, the rel)