Parabolic Approximation
Parabolic Approximation : An approximation to the wave equation in which the second derivative with respect to the global ray direction is neglected. It can be justified when the wavelength is much smaller than the characteristic length of the heterogeneity. The wave equation then becomes parabolic in type. This approximation includes diffraction and forward scattering but neglects backscattering. See Sato et al. (2002)
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