When I first saw this in a large gap in the clouds it was a full arc, the brightest and most colourful I have ever seen. The cirrus forming it was barely visible which added to the effect.
Solar altitude 19 degrees.
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Unfortunately low cloud quickly blocked it out again, by the time I had got the camera and the cloud cleared it had faded considerably.
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Although the large cloud soon moved off it was too late and the arc had became ragged and weak.
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This patch of colour was all that was left a minute later.
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Canon EOS 20D 22nd January 2007
Berkshire, England