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22° Halo

A 22° halo is an optical phenomenon that belongs to the family of ice crystal halos, in the form of a ring with a radius of approximately 22° around the Sun or Moon (in which case it is also called a moon ring or winter halo). It forms as the sun- or moonlight is refracted in millions of hexagonal ice crystals suspended in the atmosphere. The halo is large; the radius is roughly the size of an outstretched hand at arm's length.  A 22° halo may be visible on as many as 100 days per year—much more frequently than rainbows.









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