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- W1973684238 abstract "The emergent intensity from the cloud tops of Venus has been measured by the Venera 9 orbiter along five paths on the illuminated disk. These radiance distributions at 3500 Å contain information on the vertical and horizontal structure of the clouds and explicitly show the effects of the small- and large-scale ultraviolet markings. Model calculations with a Mie phase function for 1.05-μm sulfuric acid aerosols indicate that the clouds have a layered structure. The best agreement is obtained with a conservative scattering top layer with an optical thickness of about 2 and a lower layer composed of a mixture of H2SO4 and large (∼10-μm) absorbing particles. However, to match the data from each phase angle, it is found that the top one-eighth of an optical thickness of clouds must consist of submicron aerosols which scatter more isotropically than 1-μm aerosols. In the lower layer, for assumed radii of 1 and 10 μm for the acid and absorber, respectively, the average number density of the absorbing aerosol is in a ratio to sulfuric acid of about 1 in 1000. The dark equatorial band seen in Mariner 10 photometry, however, could have as much as 212 times this concentration of absorber. It is demonstrated that large-scale horizontal inhomogeneities ( > 1000 km) must be considered to supplement any analysis based on a horizontally homogeneous model. The shape of the observed radiance distributions are affected by the ultraviolet “Y” feature and the equatorial band. Erroneous conclusions are unavoidable if the analysis ignores these horizontal inhomogeneities in matching distributions." @default.
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- W1973684238 date "1979-09-01" @default.
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- W1973684238 title "The ultraviolet markings on Venus: An analysis of the Venera 9 data" @default.
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- W1973684238 doi "https://doi.org/10.1016/0019-1035(79)90150-7" @default.
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