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Approach to the description of effect of a clustering in air is offered. This effect can be described as an impurity clustering in the squeezed streams. On the basis of the diffusive equations for density of number of filament estimates of the sizes cluster from the size of average intensity are carried out. The equations for density of number of filament were formulated by authors for the description of a multiple filamentation in air earlier.
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A. A. Zemlyanov, A. D. Bulygin, "Clustering of filament in air," Proc. SPIE 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics, 96802A (19 November 2015); https://doi.org/10.1117/12.2205966