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> Tangent Arcs above Balaton lake
Tangent Arcs above Balaton lake
author: T.Ladanyi/Novapix
reference: t-met03-80012
Image Size 300 DPI: 30 * 20 cm
Atmospheric halos and arcs appear around the Moon in this winter view from Lake Balaton, Hungary. Known as 22-degree halo, its a common atmospheric phenomena around the sun or the moon, specially in regions with cold temperatures. But this view also displays a bright upper tangent arc and a lower tangent arc. These arcs are atmospheric optical phenomenon which appears tangent to the 22° halo around the sun or the moon. The tangent arc form when hexagonal rod-shaped ice crystals in cirrus clouds have their long axis oriented horizontally, while otherwise rotated in any direction. This orientation of the crystals also produces 22° halos and sun/moon dogs, but a predominant horizontal orientation is required to produce a crisp tangent arc, as recorded in this image. February 2010.
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