The region of applicability of the modified method of traveling waves in free space behind a chaotic phase screen is investigated. The model of normal fluctuations of the scattered field phase on the screen is considered in the smallangle scattering approximation. A criterion for the applicability of the modified method is obtained, which substantially extends the potentialities of using the ray interpretation of the wave field in free space as compared to the standard definition of the geometrical optics zone.
Department of Physics of Atmosphere and Mathematical Geophysics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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