A circumhorizontal arc is an optical phenomenon - an ice-halo formed by plate-shaped ice crystals in high level cirrus clouds.
The misleading term "fire rainbow" is sometimes used to describe these phenomena, although they are neither rainbows, nor related in any way to fire.
http://en.wikipedia.org/wiki/Circumhorizontal_arc

circumhorizontal arc is an optical phenomenon - an ice-halo formed by plate-shaped ice crystals in high level cirrus clouds.

The misleading term "fire rainbow" is sometimes used to describe these phenomena, although they are neither rainbows, nor related in any way to fire.

http://en.wikipedia.org/wiki/Circumhorizontal_arc

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