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Upside-down rainbow above the first pinnacle of Pinnacle Ridge, Craig Braich Ty Du, Snowdonia
© col3, Jan 2012
Never seen an upside-down rainbow before!
col3 - 03/Feb/12
Photo must be upside down.
Fiend - 03/Feb/12
Looks like a circumzenithal arc and a supralateral. Very nice catch!
cado - 03/Feb/12
Definitely upside down, saw it with my own eyes! Besides, there are two, one the right way up and the other upside-down. And thanks :)
col3 - 03/Feb/12
Very unusual - well captured!
Paul Evans - 03/Feb/12
Saw the bottom half of a rainbow up the valley from high on Gob on Carnmor.
Geoff Monaghan - 06/Feb/12
These things are generally caused by refraction through high altitude ice crystals. I did some simulation work to model these things back in the day when I was at uni. Could bore you for hours...
davidbeynon - 08/Feb/12
The upside down one seen from Gob was the actual bottom half of a rainbow, which I had not really ever visualised as being perfect circles in the right circumstances.
Geoff Monaghan - 08/Feb/12
Thanks, that's really cool that it's probably caused by ice crystals. Makes sense as there was a low freezing level that day! I would love to see a whole rainbow circle someday.
col3 - 08/Feb/12
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A lot of these crystals are shaped like little pencils, and tend to line up vertically as they fall through the air. That results in 2 bright spots to the left and right of the sun.
You only get the full halo if they are aligned randomly, which tends to happen more with shorter, fatter crystals.
davidbeynon - 10/Feb/12