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Астронет: Астрономическая картинка дня Полная круговая радуга над Австралией http://www.variable-stars.ru/db/msg/1322345/eng |
Credit & Copyright: Colin Leonhardt
(Birdseye View Photography)
Explanation:
Have you ever seen an entire rainbow?
From the ground, typically, only the top portion of a rainbow is visible because directions toward the ground have fewer raindrops.
From the air, though, the entire 360 degree circle of a
rainbow is more commonly visible.
Pictured here,
a full circle rainbow was captured over
Cottesloe Beach near
Perth,
Australia
last year by a helicopter flying between a setting sun and a downpour.
An observer-dependent
phenomenon
primarily caused by the
internal reflection
of sunlight by raindrops, the 84-degree diameter rainbow
followed the helicopter, intact, for about 5 kilometers.
As a bonus,
a second rainbow
that was more faint and color-reversed was visible outside the first.
APOD Astrophotographers:
Has your work ever been used for scientific discovery?
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.