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22 Degree Halo
a ring of light 22 degrees from the sun or moon
A halo is a ring of light surrounding the sun or moon.
Most halos appear as bright white rings but in some instances,
the dispersion of light as it passes
through ice crystals found in upper level cirrus clouds
can cause a halo to have color.
|[Image: 22 degree halo (45K)]
|Halos form when light from the sun or moon is
by ice crystals associated with thin, high-level clouds (like
A 22 degree
halo is a ring of light 22 degrees from
the sun (or moon) and is the most
common type of halo observed and is formed by hexagonal ice crystals
with diameters less than 20.5 micrometers.