Ion partitioning in the hot Io torus - The influence of S2 outgassing

Details Ion partitioning in the hot Io torus - The influence of S2 outgassing Ion partitioning in the hot Io torus - The influence of S2 outgassing

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012065m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,065-12,072.

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11

Gas Ionization, High Temperature Plasmas, Io, Outgassing, Satellite Atmospheres, Sulfur, Toroidal Plasmas, Astronomical Models, Oxygen, Time Dependence, Jupiter, Satellites, Ions, Partitioning, Plasma Torus, Sulfur, Voyager 1, Outgassing, Concentration, Abundance, Comparisons, Spacecraft Observations, Voyager 2, Composition, Models, Element Ratios, Oxygen, Sulfur Dioxide, Source, Calculations, Electrons, Injection, Diffusion, Spectra, Dynamics, Intensity, Ultraviolet, Wavelengths, Temperature, Collisions

Scientific paper

An alternative time-independent model of the ion partitioning in the hot Io torus is proposed which introduces the ratio of sulfur to oxygen in the neutral source as a free parameter. Measurements of the ion abundances in the torus plasma are presented and discussed, noting some ambiguities and identifying the features that are well established. Physical processes important to the understanding of the ion partitioning calculation are reviewed. The results of the model are discussed in the context of observational constraints, and spectroscopic constraints are discussed. It is concluded that a bimodal source model, together with a small percentage of hot electrons and a relatively short diffusion time scale, can account for the principal observational features without invoking significant time variability. In particular, the O III deficiency observed in 1981 can be obtained in a model that produces other aspects of the torus ion partitioning measured during the Voyager 1 encounter.

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