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Астронет: Астрономическая картинка дня Корона северного сияния над Норвегией http://variable-stars.ru/db/msg/1233081/eng |
Credit & Copyright: 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.
This particularly rare
purple auroral
corona occurred in 2004 high above
Harstad,
Norway.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.