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.
Q&A Related to "What causes an upside-down rainbow?"
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
http://answers.yahoo.com/question/index?qid=200610...
upper tangent arc. By Global News August 9, 2006 upper tangent arc. There must have been a halo or ring around the sun. in the opposite direction of the halo. The arcs form when
http://www.canada.com/globaltv/maritimes/story.htm...
This results in the sunlight bouncing off the ice crystals high in the atmosphere,
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sun reflecting off ice crystals.
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