Circumzenithal Arc, BC, Canada
This intense and colourful arc was seen by Taavi Babcock at Sooke on the southern tip of Vancouver Island, British Columbia, Canada in May 16, 2001. Taavi's image nicely shows the purity of the arc's colours. The refraction and dispersion of near parallel sunlight through oriented plate crystals produces purer colours than those of a rainbow. �2001 Taavi Babcock, shown with permission