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The distribution of probability density of fluctuations the scattered radiation focused laser beam in the near-ground atmosphere in rain, drizzle, and fog

Measurements of the distribution of probability density of fluctuations of the scattered radiation focused laser beam (0.63 μm) in the near-ground atmosphere in rain, drizzle and fog on the path length 130 m. It is established that the distribution of probability density unimodal and has a right skewness, standardized skewness and kurtosis increase with the growth of the scattering coefficient at close atmospheric conditions (with close values of the normalized variance and diameter (size) of the precipitation particles). The normalized skewness and kurtosis increase with the growth of the diameter (size) of particles of precipitation at close values of the coefficient of scattering. The shape of the distribution does not depend on the wind speed and its the perpendicular component to the path at close atmospheric conditions, at close values of the scattering coefficient. Most of the experimental distributions of probability density are approximated by a generalized gamma - distribution.