22 degree Halo - Ice not Ash

Although this initially looked like it might be a candidate for the ash cloud from Eyjafjallajokull the presence of the 22 degree halo confirms it was natural cirrus.

It was also the only halo effect seen in a contrail free sky. Quite a number of sundogs form in cirrus that started out as a contrail.

Canon EOS 20D   15th April 2010
Berkshire, England

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