Credit & Copyright: Mario Cogo
Explanation:
Difficult to observe, the momentary
green flash above
the rising or setting sun
has been documented as
a phenomenon caused by the atmospheric
bending or refraction of sunlight.
Like a weak prism, the Earth's atmosphere breaks
white sunlight into
colors, bending red colors slightly and green and blue colors
through increasingly larger angles.
When the sky is clear, a
green flash just above the sun's edge
can sometimes be seen for a second or so, when the sun is
close to a distant horizon.
A blue flash is even harder to see though, because the atmosphere
must be extraordinarily clear to avoid scattering
and diminishing the refracted blue sunlight.
Still, from a site near
Roques de los Muchachos (altitude 2,400 meters) on La Palma
in the Canary Islands,
astrophotographer Mario Cogo captured this dramatic telescopic image of
a blue flash on color film in October of 2001.
The image of the setting Sun with large sunspot groups
on its surface is heavily distorted by atmospheric layers.
A lingering green rim is just visible under the tantalizing
blue flash.
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Publikacii s klyuchevymi slovami:
Refrakciya atmosfernaya - atmosfera Zemli - zelenyi luch - green flash - blue flash - refraction
Publikacii so slovami: Refrakciya atmosfernaya - atmosfera Zemli - zelenyi luch - green flash - blue flash - refraction | |
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