Ratio of oxygen to sulfur in the Io plasma torus

Details Ratio of oxygen to sulfur in the Io plasma torus Ratio of oxygen to sulfur in the Io plasma torus

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.6141s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 6141-6146.

Physics

38

Atmospheric Composition, Io, Oxygen Plasma, Plasma Equilibrium, Satellite Atmospheres, Sulfur, Atmospheric Models, High Temperature Plasmas, Positive Ions, Reaction Kinetics, Toroidal Plasmas, Jupiter, Satellites, Io, Plasma Torus, Oxygen, Sulfur, Element Ratios, Models, Calculations, Collisions, Diffusion, Equilibrium, Reaction Rates, Electrons, Ions, Partitioning, Emissions, Spectroscopy, Abundance, Voyager Missions, Uvs, Ultraviolet Spectrometer, Spacecraft Observations, Spectra, Optical Properties, Wave

Scientific paper

The relative concentrations of O and S ions in the hot dense region of the Io plasma torus (IPT) are investigated by means of model calculations based on collisional diffusive equilibrium. The spectroscopic constraints and uncertainties encountered in calculating the ion partitioning and the modeling procedures employed are discussed, and the results are presented in tables and graphs and compared with Voyager EUV data and the rocket observations of Skinner and Durrance (1986). It is found that the observed O and S emission from the IPT can be reproduced by models with approximately equal partitioning between O and S species. The assumptions and analyses leading to the conclusion (Moreno et al., 1985) that the IPT is S-dominated (by 3 to 1 or more) are analyzed in detail and rejected.

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