Parhelion - sundog Above Arc de Triomphe

The photo above showing a gorgeous parhelion or sundog above the Arc de Triomphe in Paris, France was captured just before sunset (7:55) on August 31, 2012.    Image credit: Bertrand Kulik; Bertrand’s Web site

Larger image



Motorists snarled in traffic were treated to two impressive “arcs” this late summer’s evening. Sundogs result when sunlight refracts through oriented, hexagonal plate ice crystals found in cirrus clouds. They’re observed at the same altitude as the Sun and when seen late in the day or early in the morning, as was the case here, they’re found 22 degrees away from the Sun. Note that the Sun is just off the left side of the picture. Larger diameter ice crystals produce the most colorful arcs.   Summary Authors: Bertrand Kulik; Jim Foster

via EPOD