#1 Kosmischer Blumen-Engel :-) von artus22 28.07.2009 19:01



A Floral Aurora Corona
Credit & Copyright: Zoltan Kenwell (Infocus Imagery)

Explanation: Few auroras show this level of detail. Above, a standard digital camera captured a particularly active and colorful auroral corona that occurred last week above Alberta, Canada. With a shape reminiscent of a flower, the spectacular aurora had an unusually high degree of detail. The vivid green and purple auroral colors are caused by high atmospheric oxygen and hydrogen reacting to a burst of incoming electrons. Many photogenic auroras have been triggered from a solar wind stream that recently passed the Earth. The auroras were unexpected because the initiating Sun has been unusually quiet of late.

http://antwrp.gsfc.nasa.gov/apod/image/0...kenwell_big.jpg

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