The Fokker-Planck equation for ray dispersion in gyrotropic stratified media

Abstract

The Hamilton equations of geometrical optics determine the rays of the relevant wave field in the short wavelength. We give a systematic derivation of the Fokker-Planck equation for the joint probability density of the position and unit direction vector of rays propagating in a gyrotropic stratified medium with random inhomogeneities. The results are a generalisation of previous work for the case of an isotropic medium