22 Degree Halo - Not an Ash Cloud

Another day without contrails when all the aircraft were grounded.

This cloud looked like it might be a candidate for ash but again the presence of a 22 degree halo shows it was water ice.

The halo was so faint it was hard to detect any colour, though there is a very slight orange tint to the inner edge.


Canon EOS 20D   18th April 2010
Wiltshire, England





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