An interpretation of the near-ultraviolet absorption spectrum of SO2 - Implications for Venus, Io, and laboratory measurements

Details An interpretation of the near-ultraviolet absorption spectrum of SO2 - Implications for Venus, Io, and laboratory measurements An interpretation of the near-ultraviolet absorption spectrum of SO2 - Implications for Venus, Io, and laboratory measurements

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...52..149b&link_type=abstract

Icarus, vol. 52, Oct. 1982, p. 149-165.

Astronomy and Astrophysics

Astronomy

38

Absorption Spectra, Io, Near Ultraviolet Radiation, Spectrum Analysis, Sulfur Dioxides, Ultraviolet Spectra, Venus Atmosphere, Astronomical Models, Astronomical Spectroscopy, Atmospheric Composition, Iue, Line Spectra, Pioneer Venus Spacecraft, Remote Sensing, Space Laboratories, Venus, Jupiter, Satellites, Planets, Io, Ultraviolet, Absorption, Spectra, Sulfur Dioxide, Models, Characteristics, Bands, Intensity, Comparisons, Mixing Ratio, Stratosphere, Abundance, Data, Experiments, Transmission, Wavelengths,

Scientific paper

Line characteristics of remotely sensed SO2 spectra near the UV are discussed, noting the implications for the interpretation of data gathered by the IUE of Io and ground-based and Pioneer spectra of Venus. It is shown that the ratio of mean line spacing to linewidth is greater than unity, and that fully resolved lines have features consistent with concepts of temperature and pressure broadening. The application of Beer's approximation for the absorption spectra of Venus and Io atmospheres is found to be incorrect. Further, the spectroscopic limit on the SO2 line data from Io observations by the IUE are interpreted as establishing a lower bound on the SO2 in the Io atmosphere. A greater concentration of SO2 in vapor equilibrium may be present in the lower atmosphere. Laboratory measurements to resolve the uncertainties regarding the UV spectroscopic data from Io and Venus are suggested.

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