Bright Circumzenithal Arc

The same kind of crystals that form circumzenithal arcs can also produce sundogs.

Here a circumzenithal arc is visible near the top while a sundog is visible each side of the sun, which was conveniently hidden behind a tree. There was no sign of the 22 degree halo on this occasion.

The sun was 18 degrees up, close to the optimum altitude, when this image was taken.

Just a couple of minutes later and the arc is fading as the type of crystals change. With the drifting cloud these colourful arcs were all too brief.

Canon EOS 20D   21st June 2005
Wiltshire, England

Other Halo Topics