Sundogs, Circumzenithal Arc and Sun Pillar

Several halo effects were seen spread over 2 hours on this spring Friday afternoon. As usual sundogs dominated the display, some of them quite bright.

Over a period of 4 minutes the left sundog appeared to change structure as the cirrus moved through its location.

At one point both sundogs, a trace of upper tangent and a faint circumzenithal arc were visible

The display finished at sunset with this weak sun pillar, images 8 minutes apart. What was striking in the last one is just how far up it reached, almost to the top of the image.

Canon EOS 20D   9th April 2010
Hampshire, England

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