The SO2 atmosphere and ionosphere of Io - Ion chemistry, atmospheric escape, and models corresponding to the Pioneer 10 radio occultation measurements

Computer Science

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Atmospheric Models, Io, Pioneer 10 Space Probe, Satellite Atmospheres, Sulfur Dioxides, Atmospheric Composition, Ionospheres, Molecular Ions, Radio Occultation, Sodium, Space Plasmas, Vertical Distribution, Jupiter, Satellites, Io, Sulfur Dioxide, Atmosphere, Ionosphere, Ions, Chemistry, Escape, Models, Pioneer 10, Radio Observations, Occultations, Formation, Precipitation, Electrons, Surface, Density, Sodium, Flux, Energy, Plasma, Torus, Acceleration, Wakes, Compression

Scientific paper

Some numerical models of the SO2 atmosphere and ionosphere of Io at the time of the Pioneer 10 fly-by are calculated. It is shown that the formation of the observed ionosphere in the downstream direction may have required the precipitation of electrons, and that solar EUV radiation alone cannot account for it. In a comparison with Pioneer 10 radio occultation measurements, an electron impact in the range 500-800 eV was found to agree with Pioneer 10 radio occultation data for a SO2 atmosphere with a surface density of 4 x 10 to the 10th per cu cm. The relatively narrow energy range and flux required for incident electrons suggests that a fraction of a torus plasma compresses the ionosphere. It is pointed out on the basis of the model calculations that a weak magnetic field may be associated with Io.

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