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Fogbows

Fogbows are caused by a combination of refraction and diffraction and are much rarer than rainbows. The light source has to be low at the back of the observer and the fog in the opposite direction. If the fog is also at the back of the observer, the sunlight or moonlight will not be able to penetrate it. Just like a rainbow the fogbow is low or high according to solar or lunar elevation. If the droplets are very small, the fog bow is almost colourless. If they are relatively large, there may be soft colour hues which never get as saturated as in a rainbow. The radius of a fogbow depends on droplet size. As the droplets get smaller, the fogbow gets broader and its mean radius decreases slightly. It is possible to produce a fogbow with an artificial light source like a powerful torch or a car headlight.

Fogbows often occur together with a spectre of the Brocken and sometimes with a glory.

Simulations with IRIS by © Les Cowley shown with permission.


Droplet size = 8 micron.


Droplet size = 16 micron.

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