Spokane WA Circumhorizon Arc I
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Spokane Washington State, June 3, 2006. "The Great Spokane halo display" was widely seen and will be remembered for the brightness and duration of the arc. Jonathan Fox took this image when the sun was 64° high. The halo lights the cirrus streaks with pure prismatic colours. The circumhorizon and circumzenithal arc colours are hardly smeared by ice crystal rotation and so are spectrally pure, more so than those of the rainbow. Image ©Jonathan Fox, shown with permission.