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Thursday, October 23, 2014

Astronomy Picture of the Day

 

The above image shows, however, that even during off days the Sun’s surface is a busy place.

 

sunspotloops trace 898 670x549 Astronomy Picture of the Day

Sunspot Loops in Ultraviolet
Credit: TRACE ProjectNASA

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 CelsiusLarge 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.

Visit the NASA/JPL website to view more Astronomy Pictures of the Day

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