Fire Rainbow
Published on Nov 18, 2015
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Fire Rainbow
What does it mean?
Well, a "fire rainbow" is an optical phenomenon where an ice halo is formed by plate shaped ice crystals in high level cirrus clouds. This phenomenon is also known as a circumhorizontal arc.
Photo by athos[hun]
The misleading term "fire rainbow" is sometimes used to describe these phenomena, although they are neither rainbows, nor related in any way to fire. The name comes from its appearance as a rainbow taking the shape of flames in the sky.
Formation of the halo requires that the sun be at an elevation of 58° or greater, and that a cirrus cloud or haze be present and contain plate-shaped ice crystals. The 90° inclination between the ray entrance and exit produce the spectral colours.
Circumhorizon arc
This shows how the solar rays enter the plate shaped ice crystals and refract light to form this phenomenon
The lower the latitude, the more number of days that the sun will shine at 58° or greater, therefore increasing the probability for a fire rainbow to be formed
The End
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