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Cirrus
fragments lit by a circumhorizon arc, Halifax, Nova Scotia.
Imaged
by Daniel Dupuis on 3rd July 2001 with the sun 66° high.
The CHA is so large that it often fills cirrus clouds with
its bright colours. This close up shows well the high spectral
purity of the colours.
©2001
Daniel Dupuis, reproduced with permission.
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