Influence of solar radiation reflected from the earth’s surface on the formation of the global flux

A method was developed to quantify the effect of the solar radiation flux reflected from the Earth’s surface on the atmospheric radiation field. The reflected flux was accounted for within a Lambertian model of isotropic diffuse reflection. The influence of surface-reflected radiation on the formation of the global flux power incident on a unit horizontal area at the Earth’s surface, as well as on the power of the flux reflected by the atmosphere back toward space, was demonstrated. Variations in the direct and diffuse components of radiation emerging through the lower and upper atmospheric boundaries were calculated as functions of the underlying surface albedo and the illumination angle. A relationship between the Earth’s surface albedo and the effective atmospheric albedo was established. The results enable more accurate theoretical assessments of the performance of bifacial (double-sided) solar panels, whose rear side receives energy from radiation reflected by the Earth’s surface.

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