Eliminating Multiple Scattering and Reflection of Light from the Underlying Surface from the Scattering Indicatrix
As is well known, the optical properties of the atmosphere are primarily characterized by two values: optical thickness and light scattering indicatrix. The former value characterizes the total light attenuation in the atmosphere while the latter describes the attenuation due only to scattering and gives information about the luminous fluxes scattered in different directions. While optical thickness can be determined directly, for example, by measuring direct solar radiation, the scattering indicatrix pertains to the entire thickness of the atmosphere, i.e., to a space whose height is equal to the height of the atmosphere and whose basal unit area cannot be determined directly. Brightness observations give only the brightness indicatrix, since additional brightness from higher-order scattering and reflection from the underlying surface is superimposed on the sky brightness caused by atmospheric scattering of sunlight. To obtain the true scattering indicatrix, we must eliminate from the brightness indicatrix this multiply scattered light. This is one of the central problems of atmospheric optics. I proposed a method for this that is apparently simpler than all of the others . Obviously, the error of this method must be known.
KeywordsMultiple Scattering Optical Thickness Luminous Flux True Absorption Atmospheric Mass
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