EPOD - a service of USRA
The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.
Archive - Ridge Line Induced Crepuscular Rays
July 31, 2021
6a0105371bb32c970b0134883230c8970c Every weekend we present a
notable item from our archives. This EPOD was originally published
October 19, 2010.
Photographer: Piero Armando
Summary Author: Piero Armando; Jim Foster
With a fantastic view of the Italian Alps just to the west of where
I live, I'm fortunate enough to enjoy many splendid sunsets. The
photo above lacks the fine colors that results from many such sunsets
but displays an impressive array of crepuscular rays. Since the sky
is free of cumulus turrets that often are responsible for rays,
they must form in another way. In fact, these rays are due to natural
gaps and prominences along the ridge line as well as the presence of
dust and haze in the lower atmosphere. These aerosols are very
effective in scattering sunlight. It's easy to see just where
sunlight is blocked (spurs) and allowed to stream through (notches).
Photo taken on September 1, 2010.
Photo details: Canon EOS 30D camera; manual mode; 1/1000 second
exposure; F7.1; focal length of 180 mm; image cropped.
* Turin, Italy Coordinates: 45.066667, 7.7
Related EPODs
Archive - Ridge Line Induced Crepuscular Rays Circumhorizon Arc
over Viterbo, Italy Noctilucent Clouds Above Paris on a Summer’s
Eve Archive - Lake Misurina in the Dolomite Alps Upper Tangent
Arc Observed over San José Pinula, Guatemala Rainbows Over the
Italian Shoreline
More...
Atmospheric Effects Links
* Atmospheric Optics
* Color and Light in Nature
* The Colors of Twillight and Sunset
* Refraction Index
* Image Gallery: Atmospheric Effects
* What is a Rainbow?
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