04-05-2007, 03:13 AM
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#1
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Platinum Member
Join Date: Oct 2006
Location: New Brunswick, Canada
Posts: 8,828
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Fire Rainbow
Text from Snopes:
This is a real photograph of an atmospheric phenomenon known as a circumhorizon(tal) arc, the example shown above was captured on camera as it hung for about an hour across a several-hundred square mile area of sky above northern Idaho (near the Washington border) on June 2006.
In general, a circumhorizontal arc (or "fire rainbow") appears when the sun is high in the sky (i.e., higher than 58 deg; above the horizon), and its light passes through diaphanous, high-altitude cirrus clouds made up of hexagonal plate crystals. Sunlight entering the crystals' vertical side faces and leaving through their bottom faces is refracted (as through a prism) and separated into an array of visible colors. When the plate crystals in cirrus clouds are aligned optimally (i.e., with their faces parallel to the ground), the resulting display is a brilliant spectrum of colors reminiscent of a rainbow.
I got it in an email and decided to check to see if it is real on Snopes.
http://www.snopes.com/photos/natural/firerainbow.asp
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