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Monochrome rainbow
A Monochrome or Red Rainbow is an optical and meteorological phenomenon and a rare variation of the more commonly seen multicolored rainbow. Normally observed at either sunrise or sunset, a monochrome rainbow requires a particular combination of atmospheric conditions to form. These conditions are usually present at the beginning or end of the day, most often during rainstorms, fog, or mist. The low angle of the sun scatters the shorter wavelengths of light, such as blue, green and yellow, and atmospheric water has a further scattering effect on the sunlight. In the correct combination, these conditions can result in a red or predominantly red rainbow, which, in the lower light environment where the phenomenon most often forms, can leave a highly dramatic effect.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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