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Directory Root >> Events >> Atmospheric Optics >> Halos >> Tangent arcs

Arc tangent supérieur 04 (425 x 567 - 34 Ko)

©Serge Vasseur [info]

Photo taken on Saturday 28 January 2006 in Presles (Val d'Oise)
[Digital Photo Camera]
CANON Powershot S 50
Exposure : 1/1000s
[Without telescope]
seen 1243 times
Author 's note :
Heure locale:10h53
Hauteur du soleil:~16°
T.sol: -5°
Un soleil timide perçait alors l'épaisse couche de stratus.
Immédiatement se forme un halo(22°) faiblement coloré surmonté d'un brillant arc tangent supérieur.
Il suffisait alors d'attendre le passage très rapide, droite-gauche, d'une traînée d'avion, pour espérer voir aussi son ombre complèter le tableau: halo et arc tangent.

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