Abstract
Numerical results of reflection and transmission on plane-parallel layers with strongly anisotropic scattering are reviewed. A convenient method is to use successive scattering, doubling, and asymptotic fitting, in three size ranges. The eigenvalues determining the convergence of series in the doubling method are shown and eigenvalue problems in the other steps are described. The distribution of incident energy over reflection, transmission and absorption is shown for a wide range of parameters. Accurate tests made with different phase functions with the same anisotropy parameter g show that the moments of the reflection function (plane albedo, spherical albedo) hardly change at all but that differences up to 20 per cent, mainly due to single scattering, persist in the reflection function itself. The azimuth-dependent terms are shown to converge rapidly with growing Fourier order m and with growing order of scattering n, thus permitting various shortcuts in the computation.
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