The structure, stability, and global distribution of Io's atmosphere

Details The structure, stability, and global distribution of Io's atmosphere The structure, stability, and global distribution of Io's atmosphere

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...98..271l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 98, no. 2, Aug. 1992, p. 271-295.

Computer Science

Sound

76

Astronomical Spectroscopy, Atmospheric Composition, Io, Satellite Atmospheres, Satellite Sounding, Iris Satellites, Local Thermodynamic Equilibrium, Millimeter Waves, Sulfur Dioxides, Voyager Project

Scientific paper

The paper reports on high-resolution millimeter-wave spectroscopic observations of Io carried out in 1990 and 1991 which allowed the first unambiguous ground-based detection of SO2 in Io's atmosphere. A reassessment of the IRIS-Voyager observations of the nu3 band of SO2 is presented, and it is shown that non-LTE effects are important in the formation of this band. It is thus concluded that the global SO2 atmosphere observed from earth has characteristics (pressure, temperature) similar to those observed at Loki by Voyager. The paper concludes with a simple thermal model of Io's lower atmosphere and a discussion of new upper limits that can be placed on the presence of H2S, SO, and CO in Io's atmosphere.

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