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Green and Black Auroras Over Norway
<< Yesterday 29.03.2006 Tomorrow >>
Green and Black Auroras Over Norway
Credit & Copyright: Frank Andreassen (nettfoto.no)
Explanation: What causes gaps between aurora curtains? These unusual gaps can make Research using data from four Cluster spacecraft orbiting the Earth has likely found the secret: auroral gaps, sometimes knows as black auroras, are actually anti-auroras. In normal auroras, electrons and/or predominantly negatively charged particles fall toward Earth along surfaces of constant magnetic field. They ionize the Earth's atmosphere on impact, causing the bright glows. In auroral gaps, however, negatively charged particles may be sucked out from the Earth's ionosphere along adjoining magnetic field lines. These dark anti-auroras can climb to over 20,000 kilometers and last for several minutes. Pictured above, a series of well-defined auroral gaps is seen dividing green aurora curtains high above Harstad, Norway, earlier this month.

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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
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Russkii tekst
Based on Astronomy Picture Of the Day
Publikacii s klyuchevymi slovami: aurora - black aurora - severnoe siyanie - polyarnoe siyanie - chernoe polyarnoe siyanie
Publikacii so slovami: aurora - black aurora - severnoe siyanie - polyarnoe siyanie - chernoe polyarnoe siyanie
Sm. takzhe:
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