On Tue, 30 Aug 2011 21:11:00 +0100
Yokel wrote:

There's a rainbow there, all right - I have seen this sort of thing
myself. It is definitely *not* a circumzenithal arc. These appear
about 45 degrees above the sun and are amongst the purest of all the ice
crystal haloes with much brighter colours than any rainbow can produce -
once seen, never forgotten.

One I prepared earlier:
http://www.flickr.com/photos/5473150...7625183685100/

CZAs are neck-achingly high. 60-70degrees is /so/ much higher than
most people will, or can, look. I find that non-observers think that
50degrees is "vertical".

Looking at the original photo I think that the centre of the picture is
roughly 30degrees elevation, and agree that a rainbow in inconsistent
rainfall is the most likely explanation.


Mike