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Directory Root >> Events >> Atmospheric Optics >> Halos >> Circumzenithal Arc

Arc circumzenithal (1536 x 1152 - 213 Ko)

©Serge Vasseur [info]

Photo taken on Thursday 17 July 2003 in Sauzelles Ile d'Oléron ( Charente-Maritime )
[Digital Photo Camera]
CANON Powershot A 20
Exposure : 1/160
[Without telescope]
seen 1655 times
Author 's note :
L'Arc circumzenithal est peu frequent en optique atmospherique.
Le soleil se trouve dans ce cas à une hauteur +25° 30'.
L'image a subi un leger traitement a l'aide de Photoshop (Niveaux
automatiques); cette operation attenue tres fortement les effets de la refraction pour mettre en valeur le jeu des couleurs dans les cirrus glaces.

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