Physics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7485n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 20, 1990, p. 7485-7491.
Physics
31
Atmospheric Composition, Iue, Sulfur Dioxides, Sulfur Oxides, Venus Atmosphere, Atmospheric Chemistry, International Cooperation, Photochemical Reactions, Venus Clouds, Venus, Satellite Observations, Iue Satellite, Sulfur Dioxide, Clouds, Sulfur Monoxide, Composition, Abundance, Comparisons, Absorption, Mixing, Models, Analysis, Spectra, Spacecraft Observations, Pvo Mission, Spectrometry
Scientific paper
Results of recent International Ultraviolet Explorer observations of Venus made on January 20, 1987 and April 2 and 3, 1988 are presented along with a reanalysis of the 1979 observations (Conway et al., 1979). The observations indicate that the amount of sulfur dioxide at the cloud tops of Venus declined by a factor of 8 + or - 4 from 380 + or - 70 ppb in 1979 to 50 + or - 20 ppb in 1987 and 1988. These values are consistent with the Pioneer Venus results. Absorption features of sulfur monoxide are identified for the first time, and the SO mixing ratio above the cloud level is estimated to be 20 + or - 10 ppb for 1979. This is consistent with photochemical models by Winick and Stewart (1980) and Yung and DeMore (1982) and with the upper limit from Wilson et al. (1981).
Esposito W. L. W. L.
Na Chan Y.
Skinner Thomas E.
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