Fog Bow

A fog bow, sometimes called a white rainbow, is an optical phenomenon that resembles a rainbow but forms in fog rather than rain. Because the water droplets in fog are extremely small, under about 0.05 millimetres across, diffraction spreads and washes out the colors so strongly that a fog bow typically shows only a faint red outer edge and a bluish inner edge, and often appears almost entirely white. Sailors traditionally called fog bows sea dogs, and when the same phenomenon is seen from an aircraft looking down through cloud it is called a cloud bow instead. A fog bow is distinguished from a glory, which shows multiple pale diffraction rings, by its larger angular size and its near absence of color; when the fog droplets are unusually uniform in size, a fog bow can also show several fainter inner rings alongside the brighter primary bow. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/