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Gallery > In the sky > Circumzenithal arc in a cumulonimbus
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Circumzenithal arc in a cumulonimbus
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1024 x 958 pixels (129 kB)

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 1024 x 958 pixels 
(129 ko)
Instrument   38 mm focal length, composite of 8 pictures
Exposure & film   1/700 s with digital camera DC3400 Zoom
Date & place   January 14, 2004, Quimper
Here is a case in which a circumzenithal arc can occur. In the present case, a big cloud, a cumulonimbus, mask the Sun. The top o fthe cloud touch the troposphere and generate a kind of thin cloudy layer. In this cirrus-like cloud, the ice cristals diffract the sunlight.
So, a circumzenithal arc, visible in the upper part of the picture, appear. It remained visible a few minutes, till the thin clouds shift.
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 The others pictures of "Circumzenithal arc"
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