![Sun Dog In The Sky](http://townsquare.media/site/36/files/2010/12/Sun-Dog-image-courtesy-of-Yvonne-Dupuis2-300x200.jpg?w=980&q=75)
Sun Dog In The Sky
Sunday afternoon sky watchers were rewarded with a seldom seen "sun dog".
Sundogs are formed by plate-shaped hexagonal ice crystals in high and cold cirrus clouds or, during very cold weather, by ice crystals called diamond dust drifting in the air at low levels. These crystals act as prisms, bending the light rays passing through them by 22°. If the crystals are randomly oriented, a complete ring around the sun is seen — a halo. But often, as the crystals sink through the air they become vertically aligned, so sunlight is refracted horizontally — in this case, sundogs are seen.
As the sun rises higher, the rays passing through the crystals are increasingly skewed from the horizontal plane. Their angle of deviation increases and the sundogs move further from the sun.[2] However, they always stay at the same altitude as the sun.
Sundogs are red-colored at the side nearest the sun. Farther out the colors grade through oranges to blue. However, the colors overlap considerably and so are muted, never pure or saturated. The colors of the sundog finally merge into the white of the parhelic circle (if the latter is visible). ( definition from WikiPedia )
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