Monochrome rainbow

A Monochrome or Red Rainbow is an optical and meteorological phenomenon and a rare variation of the more commonly seen multicolored rainbow. Its formation process is identical to that of a normal rainbow (namely the reflection/refraction of light in water droplets), the difference being that a monochrome rainbow requires the sun to be close to the horizon; i.e., near sunrise or sunset. The low angle of the sun results in a longer distance for its light to travel through the atmosphere, causing shorter wavelengths of light, such as blue, green and yellow, to be scattered and leaving primarily red.[1] In the lower light environment where the phenomenon most often forms, a monochrome rainbow can leave a highly dramatic effect.


  1. Groth, Ed; Foster, Jim (2011-09-10). "Red Rainbow at Sunrise - Earth Science Picture of the Day". NASA Earth Science Division. Retrieved 2013-06-27.

Further reading

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