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Астронет: Астрономическая картинка дня Северные летние сумерки http://www.variable-stars.ru/db/msg/1744720/eng |
Credit & Copyright: Justin Anderson
Explanation:
Nights grow shorter and
days grow longer as the summer solstice
approaches in the north.
Usually seen at high latitudes in summer months,
noctilucent or night shining clouds
begin to make their appearance.
Drifting
near
the
edge of space
about 80 kilometers above the Earth's surface,
these icy clouds were still reflecting the sunlight on June 14.
Though the Sun was
below the horizon as seen
north of Forrest, Manitoba, Canada,
they were caught in a single exposure of a near midnight twilight sky.
Multiple exposures of the foreground
track the lower altitude flash of fireflies,
another fleeting apparition
shining in the summer night.
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.