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Circumhorizontal arc - Wikipedia A circumhorizontal arc is an optical phenomenon that belongs to the family of ice halos formed by the refraction of sunlight or moonlight in plate-shaped ice crystals suspended in the atmosphere, typically in actual cirrus or cirrostratus clouds
What Is a Circumhorizontal Arc? - Treehugger Circumhorizontal arcs, or "fire rainbows" as they are sometimes called, are essentially ice-halos formed by the refraction of sunlight or, occasionally, moonlight, in plate-shaped ice crystals
Circumhorizon arc - Cloud Appreciation Society In fact, a circumhorizon arc can only form when the Sun is very high – at an angle of more than 58 degrees above the horizon This means that it is a summer optical effect, and one that can only form in some parts of the world
Circumhorizontal arc | International Cloud Atlas A circumhorizontal arc (previously known as the lower circumzenithal arc) is a near-horizon arc and extends parallel to the horizon A circumhorizontal arc is as colourful and bright as a circumzenithal arc The circumhorizontal arc occurs only when the elevation of the light source is more than 58°
Circumhorizon Arc - Atmospheric Optics The circumhorizon arc is a large halo that appears parallel to the horizon when the sun is at an elevation higher than 58° It is always located beneath the sun and is approximately twice as far from the sun as the more commonly observed 22º halo
Circumhorizontal Arc - Hong Kong Observatory In fact, it was not a rainbow, but an optical phenomenon called "Circumhorizontal Arc" When sunlight or moonlight is refracted or reflected by ice crystals suspended in the atmosphere, a type of optical phenomena generally known as "halo" will be produced
Circumhorizon arc Summertime Halo: A colourful circumhorizon arc spans the sky near Fredericton, New Brunswick, Canada The halo lights brightest where the cirrus is thickest