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The arc is produced by plate oriented crystals and is a close relation to the circumzenithal arc. Light rays enter the almost vertical crystal side faces and leave via the lower horizontal face (ray path 3-1). The refraction of the almost parallel sun's rays through faces inclined at 90° produces pure, bright and well separated prismatic colours ~ purer than those of the rainbow. The colours are at their best when the crystal tilts are smallest. Large crystal tilts produce more pastel hues.
Originally posted by operation mindcrime
I never saw this before...exept in China right before the big 7.8 magintute quake hit in 2008.
Better strap down those waterboilers and find a save place to hide 'cause the big one is coming!!!!!!.........