• Source: 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.
In the lower light environment where the phenomenon most often forms, a monochrome rainbow can leave a highly dramatic effect.

In July 1877, Silvanus P. Thompson witnessed a red and orange rainbow over Lake Lucerne in Switzerland:showed only red and orange colours in place of its usual array of hues. No fewer than five supernumerary arcs were visible at the inner edge of the primary bow, and these showed red only.And there were a few more reports:.

In the background of Madonna of Foligno, there is a monochrome rainbow in orange.




References






Further reading


Sistek, Scott (24 November 2011). "Red Rainbows, Glorious Sunrises and a Very Unlucky Weather Station". KOMO News. Retrieved 27 June 2013.
Cowley, Les. "Red Rainbows". Atmospheric Optics. Retrieved 22 June 2016.

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