Other
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.8151e&link_type=abstract
Journal of Geophysical Research, vol. 85, Dec. 30, 1980, p. 8151-8157.
Other
6
Venus, Atmosphere, Clouds, Ultraviolet, Wavelengths, Absorption, Source, Pvo Mission, Spacecraft Observations, Ouvs Instrument, Ocpp Instrument, Depth, Polarization, Photochemistry, Mixing, Analysis, Brightness, Haze, Sulfur Dioxide, Models, Aerosols
Scientific paper
The UV measurements of the Venus atmosphere absorbers constrain the location, altitude, and identity near the Venus cloud tops. The spin-scan images observed by the Pioneer Venus orbiter spectrometer (UVS) and the cloud photopolarimeter measure contrasts in the 1990-3650 A range and at phase angles between 33 and 130 deg; the planet is darkest at the location where the UVS line of sight penetrates in the direction perpendicular to the cloud tops. SO2 absorption accounts for the contrast from 2000 to 3200 A; the persistence of contrast at longer wavelengths requires another absorber at about 75-mbar altitude. The correlation between the planetary differences and polarization does not need large-scale clearing or major vertical motions of the cloud tops as the main cause of the observed variations.
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