Monochrome rainbow

Short description: Atmospheric optical and meteorological phenomenon

Unenhanced photo of a Red Rainbow, taken near Minneapolis, Minnesota, USA in July 1980

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.

A double Red Rainbow taken from Cedar Point beach in Sandusky, OH. August 29, 2022. Sunset

## References

1. ↑ Groth, Ed; Foster, Jim (2011-09-10). "Red Rainbow at Sunrise - Earth Science Picture of the Day". NASA Earth Science Division. http://epod.usra.edu/blog/2011/09/red-rainbow-at-sunrise.html. Retrieved 2013-06-27.

## Further reading

* Sistek, Scott (24 November 2011). "Red Rainbows, Glorious Sunrises and a Very Unlucky Weather Station.". KOMO News. http://www.komonews.com/weather/blogs/scott/Red-rainbows-glorious-sunrises-and-a-very-unlucky-weather-station-134480328.html. Retrieved 27 June 2013.
* Cowley, Les. "Red Rainbows". Atmospheric Optics. http://www.atoptics.co.uk/rainbows/redbow.htm. Retrieved 22 June 2016.

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