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Дата изменения: Tue Sep 28 10:27:15 2004
Дата индексирования: Tue Dec 25 09:57:10 2007
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Aurora Over a Communications Tower
Astronomy Picture of the Day
    


Aurora Over a Communications Tower
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Aurora Over a Communications Tower
Credit: Frank Andreassen (nettfoto.no)
Explanation: Higher than highest communications tower, higher than highest mountain, higher than highest airplane, lies the realm of the aurora. Auroras rarely reach below 60 kilometers, and can range up to 1000 kilometers. Aurora light results from energetic electrons and protons striking molecules in the Earth's atmosphere. Frequently, when viewed from space, a complete aurora will appear as a circle around one of the Earth's magnetic poles. Pictured above is a particularly rare purple auroral corona that occurred on August 30, high above Harstad, Norway.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: aurora
Publications with words: aurora
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