Spatial distribution of plasma in the Io torus

Details Spatial distribution of plasma in the Io torus Spatial distribution of plasma in the Io torus

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7...41b&link_type=abstract

Geophysical Research Letters, vol. 7, Jan. 1980, p. 41-44.

Physics

11

Cosmic Plasma, Interplanetary Gas, Io, Plasma Diagnostics, Spatial Distribution, Toruses, Electron Density (Concentration), Ion Density (Concentration), Jupiter Atmosphere, Magnetohydrodynamic Flow, Radial Distribution, Two Dimensional Flow, Two Dimensional Models, Voyager Project, Jupiter, Satellites, Io, Torus, Plasmas, Distribution, Ions, Density, Temperatures, Voyager 1, Gradients, Models, Sulfur, Electrons, Spectrum, Diffusion, Radiation, Analysis

Scientific paper

In situ measurements of ion densities and temperatures have been analyzed to produce profiles of these plasma parameters along the Voyager 1 inbound trajectory between 7 and 5 Jupiter radii. The temperature profile shows a sharp decrease by a factor of 50 between 5.8 and 5.2 Jupiter radii corresponding to a temperature gradient of 7 x 10 to the 5th per Jupiter radius. The electron density profile, inferred from the ion density measurements, has two maxima at 5.7 and 5.3 Jupiter radii. A two-dimensional model of the spatial distribution of various ionic species in the Io plasma torus has been constructed. Using this model a contour map of electron density in a meridional plane has been made, it exhibits a well-defined inner edge to the torus at 5.6 Jupiter radii. The contour map of S(+) ion density indicates that most of the S(+) ions are concentrated close to the centrifugal symmetry surface and radially inward of the larger electron density maximum near 5.7 Jupiter radii.

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