Laboratory measurements of the microwave and millimeter-wave opacity of gaseous sulfur dioxide (SO2) under simulated conditions for the Venus atmosphere

Astronomy and Astrophysics – Astronomy

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Microwave Transmission, Millimeter Waves, Opacity, Spectral Emission, Sulfur Dioxides, Venus Atmosphere, Absorptivity, Astronomical Spectroscopy, Atmospheric Models, Carbon Dioxide, Planetary Atmospheres, Radiative Transfer

Scientific paper

Laboratory measurements have been conducted of the opacity of gaseous SO2 in a CO2 atmosphere at 12.3 cm, 1.32 cm, and 0.32 cm, with a view to the effects of this gas on the mm-wave emission of the Venus atmosphere. Close agreement is noted between the results obtained and the absorptivity predicted from a Van Vleck-Weisskopf formalism at the two shortest wavelengths, but not at the longest. These results have been incorporated into a radiative transfer model in order to infer an abundance profile for gaseous SO2 in Venus' middle atmosphere, and are also used to ascertain the effects of a SO2/CO2 gaseous mixture on the mm-wavelength spectrum of Venus.

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