Halo around the Sun - Sun Halo - Halos are due to the light of...

Halo around the Sun - Sun Halo - Halos are due to the light of the Sun reflected by high-altitude clouds, cirrostratus, composed of ice crystals. They bend the light and cause a perfect circle around the Sun. Here we can see: - around the Sun, the halo of 22* radius, rather little contrast. - on the right of the Sun, a brilliant parhely but little colour. - at the top of the halo of 22* radius, the upper arc tangent in the shape of a U evase. - above, “” parallele””” to the halo of 22* radius, the arc of Parry. - near the zenith, the cirucmzenithal arc, very colorful. - just in below, tangent and very discreet, l'arc supralateral. 28 October 2006, Quimper Halos are caused by sunlight being refracted by cirro - stratus clouds. These are thin clouds, very high in the atmosphere, and are composed of ice crystals. They bend light at a 22 degree angle, which creates a halo around the sun that is 44 degrees in diameter. In brief: - around the Sun, the 22* halo, not very contrasted. - on the right of the Sun, a bright parhelia uncolored. - atop the 22* halo, the upper tangent arc (a splayed U shape). - above it, “” parallel”” to the 22* halo, the Parry arc. - near the zenith, the cirucmzenithal arc, very colorful. -, tangent to it, the inconspicuous supralateral arc