A new algorithm of the Monte Carlo method is suggested for statistical estimating the visible radiation intensity at any arbitrary point of the atmosphere caused by reflection of solar light fluxes by the spherical Earth surface. The algorithm allows the albedo of the optically homogeneous Earth surface to be taken into account beyond the scheme of statistical modeling the trajectories of photons wandering in the medium. Based on numerical experiments (in the visible wavelength range), the influence of inhomogeneity of the Earth surface illumination on the intensity of light fluxes reflected by the Earth surface is investigated. The results obtained are compared with the data calculated for the plane-parallel model of the atmosphere, and the azimuth dependence of the radiation intensity on the characteristics of the Earth surface is investigated.
radiative transfer, Monte Carlo method, spherical geometry