![]() ![]() Dust, pollen, smoke and water vapour are common causes of Mie scattering which tends to affect longer wavelengths than those affected by Rayleigh scattering. Mie scattering occurs when the particles are just about the same size as the wavelength of the radiation. At sunrise and sunset the light has to travel farther through the atmosphere than at midday and the scattering of the shorter wavelengths is more complete this leaves a greater proportion of the longer wavelengths to penetrate the atmosphere. blue) of the visible spectrum are scattered more than the other (longer) visible wavelengths. As sunlight passes through the atmosphere, the shorter wavelengths (i.e. The fact that the sky appears "blue" during the day is because of this phenomenon. Rayleigh scattering is the dominant scattering mechanism in the upper atmosphere. Rayleigh scattering causes shorter wavelengths of energy to be scattered much more than longer wavelengths. These could be particles such as small specks of dust or nitrogen and oxygen molecules. Rayleigh scattering occurs when particles are very small compared to the wavelength of the radiation. There are three (3) types of scattering which take place. How much scattering takes place depends on several factors including the wavelength of the radiation, the abundance of particles or gases, and the distance the radiation travels through the atmosphere. Scattering occurs when particles or large gas molecules present in the atmosphere interact with and cause the electromagnetic radiation to be redirected from its original path. ![]()
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