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Астронет: Астрономическая картинка дня Корона полярного сияния над Норвегией http://variable-stars.ru/db/msg/1323245/eng |
Credit & Copyright: Harald Albrigtsen
Explanation:
Higher than the highest mountain 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 atoms and molecules in the
Earth's atmosphere.
Somewhat uncommon, an
auroral
corona appears as a center point for a surrounding display and may occur when
an aurora develops directly overhead, or when
auroral rays are pointed nearly toward the observer.
This picturesque but brief green and purple
aurora exhibition
occurred last month high above
KvalЬya,
TromsЬ,
Norway.
The SessЬyfjorden
fjord runs through the foreground,
while numerous stars are visible far in the distance.
APOD Wall Calendar:
Land and Skyscapes
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.