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Credit: E. Wiebe

This is not a rainbow. It's a circumzenithal arc seen over Greater Victoria, BC. It occurs when light from the sun (below the arc in the image, but far away in space) refracts through the face and edge of thin plate-like ice crystals high in the atmosphere. It's one of many optical effects you can see if you look up more often.

Circumzenithal Arc.

UVic / SEOS / Climate Group / About Front Page Picture / Circumzenithal Arc Last updated: Thursday, 02-Jan-2014 14:48:37 PST
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