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The Weblog at The View from the Core - Sat. 06/10/06 07:05:43 AM
   
         
         
   

Circumhorizon Arc

Washington-Idaho, Saturday, June 3, 2006.

Circumhorizon Arc, Washington-Idaho, Saturday, June 3, 2006
Circumhorizon Arc, Washington-Idaho, Saturday, June 3, 2006

(Source.)

Here's a description of a circumhorizon arc:

An arc parallel to the horizon and found at least 46 below the sun (or moon). It is produced by the refraction of light through the 90 prisms of ice crystals, having entered through the vertical sides and passing out through the horizontal bases. Normally, the crystals are large, oriented, hexagonal plates. The circumhorizontal arc is the low sky counterpart of circumzenithal arc. The circumhorizontal arc is low in the sky when the sun is high (above 58 elevation); the circumzenithal arc is high in the sky when the sun is low (below 32 elevation). The most colorful circumhorizontal arcs occur when the refraction is close to the minimum angle of deviation, and this corresponds to a solar elevation angle of about 68. In the midlatitudes, the sun only climbs to that elevation for a few hours mid day around the summer solstice.

Thanks, Jimmy.

P.S. More photos.

Lane Core Jr. CIW P — Sat. 06/10/06 07:05:43 AM
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