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Recent determinations of the solar ultraviolet spectrum made by various authors are examined and an attempt is made to explain the high transmission values found by some of these in terms of the forward scattering characteristic of Mie particles of a moderate refractive index. The Bouguer-Langley method used heretofore in the reduction of data, is shown to be more or less inaccurate in the determination of the solar ultraviolet from ground stations.It is claimed that the nature and quantity of some aerosol components can be successfully investigated by means of solar spectrophotometry provided the difference between the “observed” and theoretical optical thickness is carefully analyzed in terms of the scattering by Mie particles and other non-Rayleigh scatterers permanently present in the atmosphere.
Deirmendjian et al. (Wed,) studied this question.