Io's interaction with the plasma torus - A self-consistent model

Details Io's interaction with the plasma torus - A self-consistent model Io's interaction with the plasma torus - A self-consistent model

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.9949w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Sept. 1, 1987, p. 9949-9961. BMFT-supported research.

Other

45

Io, Plasma Interactions, Self Consistent Fields, Toroidal Plasmas, Current Density, Electric Fields, Field Aligned Currents, Gas Density, Planetary Atmospheres, Planetary Magnetic Fields, Three Dimensional Models, Jupiter, Satellites, Io, Interaction, Plasma, Torus, Models, Simulation, Numerical Methods, Electric Fields, Density, Distribution, Calculations, Turbulence, Magnetic Fields, Currents, Polarization, Upstream, Diagrams, Parameters, Atmosphere, Ionosphere, Gases, Comparisons, Geometry

Scientific paper

The interaction between Io and the plasam torus is simulated by a three-dimensional numerical model which allows the calculation of electric fields, current-density distributions, and magnetic fields in Io's vicinity and in the Alfven wings. The model is self-consistent in the sense that the influence of magnetic field disturbances on the electric field is taken into account and vice versa. A two-dimensional elliptic differential equation for the electric potential is derived by using Euler potentials. The current density in Io's vicinity is decomposed into poloidal and toroidal fields. This representation allows an effective integration to get the magnetic-field disturbances. Pedersen, Hall, inertial (or polarization), and field-aligned currents are calculated. Results for different upstream plasma conditions and atmosphere/ionosphere models are presented, and the consequences of variations in neutral density, Alfvenic Mach number, and other parameters are discussed. A series of simple spherically symmetric atmosphere/ionosphere models with neutral gas densities (1-10) x 10 to the 16th/cu m are investigated. Comparison with Voyager magnetic-field measurement gives agreement for a column density of 7.5 x 10 to the 21st/sq m (surface density N0 = 5 x 10 to the 16th/cu m, scale height H = 150 km).

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