halo

halo

A prismatically colored or whitish circle or arc of a circle, with the sun or moon at its center. Coloration of a halo changes from red inside to blue outside, which is opposite to the coloration of a corona. See corona.

A halo is fixed in size and has an angular diameter of 22° (common) or 46° (rare). Halos are characteristic of clouds composed of ice crystals and are useful in telling the difference between cirriform (ice) clouds and lower clouds, which are composed of liquid water.

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