35,000ft Circumhorizon arc ~ Imaged by Grant Goodge over the Eastern Mediterranean Sea. "It was incredible to be flying at 550 mph at 35,000' and see this feature that lasted about 20 minutes, sometimes brighter than other times, but always there."

©Grant Goodge, shown with permission
Ice crystals in cirrus cloud even higher than the aircraft formed the halo. Solar rays entered the side faces of hexagonal horizontal plate crystals to exit through their lower faces. The refraction through the resulting 90° prism produced the wide dispersion of colours.
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