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The red hues of the sky at sunset and sunrise are caused by Mie Scattering. The colors of the sky throughout the day and at sunrise and sunset, are explained by both Rayleigh Scattering and Mie Scattering. The colour of the sky described by Rayleigh Scattering applies to the hues of blue, violet and green, not to the reds, oranges, peaches and purples of sunrise and sunset. Rayleigh Scattering is scattering of shorter wavelength light, like blue or violet, by air atoms and molecules. The magnitude or strength of Rayleigh Scattering varies in wavelength, and hence does not explain the beautiful variations of reds, purples, oranges and peachy colors. The latter colors arise from Mie Scattering, low angle scattering of light off dust, soot, smoke, and ash particles. Mie Scattering is beautifully recognizable down-wind of and after dust storms, forest fires and volcanic eruptions that inject large quantities of fine particulate matter into the atmosphere.
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