images

Fogbow

by

Sauli Koski/Novapix

Reference

t-met03-30013

Date

2012-03-11

A fogbow is forming like a rainbow. The sunlight reflects in the fog droplets, but thoses droplets are much more smaller than the raindrops: about hundredths millimeters for the fog instead of about one millimeter for the rain. Thus, the diffraction in the fog droplets is leading, then the colors are refracted under angles between 30 and 45° around the antisolar point (at the opposite of the Sun). Then the colors mixe and one can see a white light bow, with sometime blue in the interior and red in the exterior, larger than a rainbow