Physics – Optics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32.1190t&link_type=abstract
(NASA, State University of New York, AAS, and AGU, Conference on the Atmosphere of Venus, NASA Goddard Institute for Space Studi
Physics
Optics
13
Albedo, Image Contrast, Optical Polarization, Ultraviolet Radiation, Venus Clouds, Astronomical Models, Atmospheric Optics, Rayleigh Scattering, Venus Atmosphere
Scientific paper
Models for the origin of the contrasts in the ultraviolet images of Venus are examined in an attempt to determine the physical differences between light and dark regions fundamental to a clear understanding of the apparent cloud motions. To evaluate the meaning of the wavelength dependence of the contrasts, an improved determination of the spherical albedo curve for Venus in the 0.225-1.06 micron range is made by fitting appropriate theoretical models to the observations of monochromatic magnitudes as a function of phase angle. It is shown that, because of differences between the spectral dependences of spherical albedo and contrasts, at least one major absorber other than the one causing the contrasts is almost certainly required. Several classes of models are compatible with present observational evidence. The contrasts and the absorption associated with them may in fact be occurring below, within or above the main visible cloud layer, and thus an unambiguous interpretation of the apparent cloud motions is not possible.
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