Interpretation of the variation of polarization over the disk of Venus

Details Interpretation of the variation of polarization over the disk of Venus Interpretation of the variation of polarization over the disk of Venus

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32.1133k&link_type=abstract

Journal of the Atmospheric Sciences, vol. 32, June 1975, p. 1133-1139.

Other

9

Albedo, Atmospheric Models, Optical Polarization, Solar Radiation, Venus (Planet), Astronomical Models, Polarization Characteristics, Sunlight, Venus Atmosphere, Venus Clouds

Scientific paper

The polarization of reflected sunlight is computed for model atmospheres of Venus as a function of location on the apparent planetary disk. The calculations are for both homogeneous and layered models, as required to investigate the vertical distribution of particles. The results are compared with available observations. It is shown that the Rayleigh scattering observed in the polarization of Venus originates primarily from within the visible clouds, rather than from above the clouds. The visible 'clouds' are actually a very diffuse hazy region, and this visible-cloud layer extends at least up to the level where the pressure is of the order of 10 mb. The results indicate that the atmosphere behaves more nearly as the so-called 'homogeneous model' than as the 'reflecting-layer model'. However, there is some indication in the data that the turbidity increases with depth into the atmosphere. This conclusion receives stronger support from a comparison of particle number densities obtained from the polarization data with the number densities obtained from other observations which refer on the average to higher and lower levels in the atmosphere.

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