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“For light to enter the cirrus cloud crystals at just the right angle to make a circumhorizon arc, the sun must be at an angle of at least 58 degrees above the horizon.”
“A circumhorizon arc only forms when the clouds contain a specific, hexagonally shaped ice crystal.”
“Several very specific conditions must exist in tandem for a circumhorizon arc to occur.”
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vanishedone The Cloud Appreciation Society: 'The summertime halo, the fire rainbow, the circumhorizon or the circumhorizontal arc… Whichever of its names you decide call it, this enormous, rare, pastel-coloured optical effect will only appear up in the sky when several different factors happen to occur at the same moment.' Jul 2, 2008