Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7611983s&link_type=abstract
Presented at Workshop on Jupiter, Tucson, Ariz., 18-23 May 1975
Physics
Atmospheric Models, Io, Ionospheric Electron Density, Ions, Plasma Sheaths, Jupiter Atmosphere, Pioneer Space Probes, Planetary Magnetic Fields, Plasmas (Physics), Radio Emission, Sodium Vapor, X Rays
Scientific paper
A model is presented that suggests that plasma sheaths form between the ionospheric plasma moving with Io and the ambient plasma corotating with Jupiter. Potentials across these sheaths could be as high as 580 kV which is the motional emf across Io's ionosphere. Electrons and ions can be accelerated across these sheaths. The sheaths may exist at the top of the Io ionosphere with characteristic thicknesses of 1/4 kilometers. The model is consistent with the Pioneer observations of 0.15 MeV electrons at the inner edge of Io's L-shell and the enhanced number density of low-energy protons at the outer edge. Ion sputtering of the Io surface is discussed and may explain the presence of atomic hydrogen and sodium in the vicinity of Io. Also these accelerated particles may be important to the formation of the Io ionosphere. High electron flux which may lead to decametric radio emissions, Jovian atmospheric heating and optical and X-ray emissions is also discussed.
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