Sulfur dioxide on Io - Spatial distribution and physical state

Details Sulfur dioxide on Io - Spatial distribution and physical state Sulfur dioxide on Io - Spatial distribution and physical state

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...57...83h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 57, Jan. 1984, p. 83-92.

Astronomy and Astrophysics

Astronomy

49

Infrared Astronomy, Io, Satellite Surfaces, Solidified Gases, Spatial Distribution, Sulfur Dioxides, Albedo, Iue, Jupiter (Planet), Satellite Atmospheres, Jupiter, Satellites, Sulfur Dioxide, Distribution, Physical Properties, Io, Comparisons, Spectra, Experiments, Frost, Absorption, Source, Infrared, Wavelengths, Ultraviolet, Voyager Missions, Iue, Mixing, International Ultraviolet Explorer

Scientific paper

Observations of the 4-micron SO2 band on Jupiter's satellite Io and laboratory measurements of SO2 frost are presented. The observations confirm the existence of a large longitudinal variation in band strength, but show no evidence of temporal changes. Comparison of the band position and shape in Io's spectrum with those in the laboratory frost's suggests that the bulk of the absorption on Io is due to frost, not adsorbed gas. The derived SO2 coverage is large enough to require that SO2 be present in most terrain types on Io and not just in the white plains unit. To reconcile the infrared observations that indicate large amounts of SO2 with the ultraviolet observations of Voyager and IUE that show little, the SO2 must be mixed intimately with the sulfur (or other material) so that at each wavelength the darker component dominates the spectrum.

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