What causes an upside-down rainbow?

Answer

An upside-down rainbow is a rare phenomenon caused by refraction of sunlight through horizontally-oriented ice crystals. This usually occurs in cirrus stratus clouds rather than raindrops. It is also known as circumzenithal arc.
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Coronas can be found when the lower atmosphere has suspended water droplets in the form of a very thin cloud. As the Sun's light passes through these droplets it is refracted to form
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This results in the sunlight bouncing off the ice crystals high in the atmosphere,
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