Circumzenithal Arc Over La Seyne

November 25, 2004


Provided and copyright by: Jean-Louis Venne
Summary authors & editors: Jean-Louis Venne; Jim Foster

The above photo of an especially colorful circumzenithal arc was captured above La Seyne-sur-Mer (southern France), this past September, at about 7:00 p.m (local time). The Sun was approximately 30 degrees above the western horizon, and the circumzenithal arc was perhaps 70 degrees above the horizon). Circumzenithal arcs, as is the case with all halo phenomena, owe their color to refraction in hexagonal ice crystals. In order to observe these majestic arcs, the Sun must be lower than about 32 degrees above the horizon.

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