Photo in the News: Rare "Rainbow" Spotted Over Idaho 8745
http://news.nationalgeographic.com/news/2006/06/060619-rainbow-fire.html
by joeyo
Wed Jun 21st, 2006 5:25pm
(from #bor)
[score: 431 | approval: 100%]
![Photo in the News: Rare "Rainbow" Spotted Over Idaho](http://www.bordom.net/image/cache/aHR0cDovL25ld3MubmF0aW9uYWxnZW9ncmFwaGljLmNvbS9uZXdzLzIwMDYvMDYvaW1hZ2VzLzA2MDYxOS1yYWluYm93LWZpcmVfYmlnLmpwZw== "Photo in the News: Rare "Rainbow" Spotted Over Idaho")
The arc isn't a rainbow in the traditional sense- it is caused by light passing through wispy, high-altitude cirrus clouds. The sight occurs only when the sun is very high in the sky (more than 58%uFFFD above the horizon). What's more, the hexagonal ice crystals that make up cirrus clouds must be shaped like thick plates with their faces parallel to the ground.
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