parhelia
sundogs, mock suns or parhelia
a pair of brightly colored spots, one on either side of the sun.
sundogs form as sunlight is refracted by hexagonal plate-like ice crystals with diameters larger than 30 micrometers and their flat faces horizontally oriented.
sundogs are visible when the sun is near the horizon and on the same horizontal plane as the observer and the ice crystals. as sunlight p-sses through the ice crystals, it is bent by 22 degrees before reaching our eyes, much like what happens with 22 degree halos. this bending of light results in the formation of a sundog.
the difference between sundogs and halos is the preferential orientation of the ice crystals through which the light p-sses before reaching our eyes. if the hexagonal crystals are oriented with their flat faces horizontal, a sundog is observed. if the hexagonal crystals are randomly oriented, a halo is observed.
wow, look at the sun! there are beautiful parhelia today.
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