cirrus clouds

cirrus clouds

Lucas Thanos ~ Reminiscence

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music by Lucas Thanos photographs by various artists A Parry arc is a rare halo, an optical phenomenon which occasionally appears over a 22° halo together with an upper tangent arc. (http://en.wikipedia.org/wiki/Parry_arc) The circumzenithal arc or circumzenith arc (CZA), also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow; but it arises from refraction of sunlight through horizontally-oriented ice crystals, generally in cirrus clouds, rather than from raindrops. It forms no more than one-quarter of a circle centered on the zenith and on the same side as the sun. Its colors are from blue on the inside to red on the outside of the arc. It is one of the brightest and most colorful halos. Its colors are purer than those of the rainbow because there is much less color overlap in its formation. The first impression is that of an upside-down rainbow. The circumzenithal arc has been called "a smile in the sky". It is rarely noticed because it occurs so far overhead. Cirrus clouds which cause a sun dog can cause a circumzenithal arc when they reach the zenith, if the Sun is low in the sky. (http://en.wikipedia.org/wiki/Circumzenithal_arc) A 22° halo is a halo, one type of optical phenomenon, forming a circle 22° around the sun, or occasionally the moon (also called a moon ring or winter halo). It forms as sunlight is refracted in millions of randomly oriented hexagonal ice crystals suspended in the atmosphere. The halo is large; the radius is roughly the size of an outstretched hand at arms length (http://en.wikipedia.org/wiki/22%C2%B0_halo) ------------------------------------------------------------------- (Lucas Thanos on FaceBook) https://www.facebook.com/groups/333925146744595/ https://www.facebook.com/lucas.thanos http://www.facebook.com/pages/Lucas-Thanos/227632094019565 (Lucas Thanos Tumblr) http://lucas-thanos.tumblr.com (Lucas Thanos on Vimeo) http://vimeo.com/lucasthanos (Lucas Thanos on MySpace) http://www.myspace.com/lucasthanos (Lucas Thanos on ReverbNation) http://www.reverbnation.com/lucasthanos (Lucas Thanos on YouTube) http://www.youtube.com/user/lucasmusic4u (Lucas Thanos on Twitter) http://www.twitter.com/lucasthanos (Lucas Thanos on DailyMotion) http://www.dailymotion.com/Lucas_Thanos (Aeschylus' Oresteia by Lucas Thanos on FaceBook) https://www.facebook.com/AeschylusOresteiaByLucasThanos (Ancient Greek Civilization) https://www.facebook.com/TheGreekCivilization (NeoMagazine about Aeschylus Oresteia by Lucas Thanos) http://www.neomagazine.com/2012_11_november/24.html#.UKZg1NCB_Nw.gmail