Low-Arch rainbowThis delightfully-shaped rainbow was captured in 2012 over Illinois. The shape and d
Low-Arch rainbowThis delightfully-shaped rainbow was captured in 2012 over Illinois. The shape and distance to a rainbow depends on the angle of the sun and the horizon; when the sun is about 40 degrees above the horizon, a rainbow in the opposite direction will flatten out, forming almost a horizontal band. If the sun is any higher in the sky, then a rainbow won’t be visible because it would actually be located below the horizonIn this rainbow, the colors repeat – a setup known as supernumeraries. These bands appear when the water droplets in the air are of an appropriate size for different bands of light to bounce off the edges of water droplets at different angles. These bands can change in location or thickness rapidly as the size of water droplets in the air changes.-JBBImage credit: Melinda Swinford (creative commons licensed)https://flic.kr/p/ddmNQiRead more:https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/wea.274http://www.atoptics.co.uk/rainbows/supform.htm -- source link
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