It is shown in the Markovian approximation, that as the optical thickness of a layer of nonuniformities increases the spatiotemporal coherence function of the random Green's function becomes Gaussian. It is shown that the form of this function is determined by the geometric parameters of the layer and the component of the wind velocity that is perpendicular to the propagation path. Methods for measuring these parameters by remote sensing in the case of isotropic turbulence are analyzed.
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