Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...79...56h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 79, May 1989, p. 56-74. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
45
Astronomical Models, Io, Planetary Composition, Planetary Structure, Planetary Surfaces, Basalt, Europa, Planetary Evolution, Sulfur, Sulfur Dioxides, Jupiter, Satellites, Io, Models, Surface, Composition, Sulfur Dioxide, Optical Properties, Spectra, Sulfur, Silicate, Volcanoes, Distribution, Deposits, Condensates, Hypotheses, Polysulfur Oxide, Sputtering, Mixing, Disulfur Monoxide, Wavelengths, Layers, Europa, Comparisons
Scientific paper
The role of elemental sulfur on Io is evaluated in light of duplications of its spectral properties by combinations of basalt and condensates of SO2 and its S2O and polysulfur oxide (PSO) dissociation products. Elemental sulfur is not seen to be present in spectrally significant amounts. It is instead suggested that Io's exposed surface consists of mafic silicates which have been partially covered by thin deposits of SO2, PSO, and S2O. A model in which most of the spectrally active frost occurs in the form of thin and ephemeral partial coatings on the topmost regolith particles is seen as most consistent with observations. Attention is drawn to similarities with the surface of Europa.
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