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Sundog, upper tangent arc, Parry arc, supralateral arc, and circumzenith arc

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Date:30.8.2005 Optics:f = 20 mm
Place:Four Mile Creek, NY Observer:Till Credner

© Copyright by the observers

Approaching remnants of hurricane Katrina brought these high cirrus clouds with interesting optical effects. Hexagonal ice crystals produce such kind of arcs in the atmosphere.

See also:
further images of Halos
M.G.J. Minnaert: "Light and Color in the Outdoors", Springer-Verlag
R. Greenler: "Rainbows, Halos, and Glories", Cambridge University Press
L. Cowley: "Atmospheric Optics" web site
Meteoros site on Halos