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Астронет: Астрономическая картинка дня Солнечная колонна http://www.variable-stars.ru/db/msg/1182160/eng |
Credit & Copyright: Dave Liquorice
Explanation:
Have you ever seen a sun pillar?
When the air is cold and the Sun is rising or
setting, falling
ice crystals can reflect sunlight and create an
unusual column of light.
Ice sometimes forms flat, stop-sign
shaped crystals as it falls from high-level
clouds.
Air resistance causes these crystals to lie nearly
flat much of the time as they flutter to the ground.
Sunlight reflects off crystals that are
properly aligned,
creating the sun-pillar effect.
In the above picture, a
sun-pillar reflects light from a setting Sun.
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.