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Creator of "Dinotopia"! This daily weblog by James Gurney is for illustrators, comic artists, plein-air painters, sketchers, animators, art students, and writers.
1. Circumzenithal Arc
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By: James Gurney, on 4/19/2015
Blog: Gurney Journey (Login to Add to MyJacketFlap)
JacketFlap tags:  Effects/Phenomena, Add a tag

A few days ago I photographed this circumzenithal arc in the sky above the Hudson Valley. These halo phenomena are sometimes called "smiles in the sky" or "upside down rainbows."

Unlike a normal rainbow, which describes a circle centered around the antisolar point (directly opposite the sun), this light effect curves around the zenith. The colors appear on the section of the circle closest to the setting sun.

Whereas the regular rainbow is the result of sunlight bouncing back to the eye in suspended raindrops, this effect occurs when sunlight refracts through plate-shaped hexagonal ice prisms floating in a horizontal position in cirrus clouds. Therefore, it often appears interrupted as it intersects the parallel tendrils of the clouds.
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Wikipedia on circumzenithal arc
More at Atmospheric Optics
Classic book on light/atmosphere phenomena: The Nature of Light and Colour in the Open Air

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