A new definition is introduced for an effective refractive index of a randomly inhomogeneous medium, which describes the wave field in the medium. Within the framework of the diffusion approximation, the one-point probability density function of the effective refractive index is found, which makes it possible to calculate any of its statistical characteristics. Conditions for the applicability of these results are established for the case when the medium inhomogeneities have a finite correlation distance.
Department of Physics of Atmosphere and Mathematical Geophysics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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