Alfven wave propagation in the Io plasma torus

Physics

Scientific paper

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Io, Jupiter Atmosphere, Magnetohydrodynamic Waves, Plasma Waves, Space Plasmas, Toroidal Plasmas, Decametric Waves, Earth Magnetosphere, Magnetic Field Configurations, Plasma Diagnostics, Radio Emission, Wave Reflection, Jupiter, Satellites, Io, Plasma Torus, Alfven Waves, Propagation, Voyager 1, Pls, Plasma Science Experiment, Models, Magnetic Fields, Patterns, Magnetosphere, Geometry, Structure, Distribution, Emissions, Decameter Waves, Radio Emmisions

Scientific paper

Voyager 1 plasma measurements are combined with a model of Jupiter's magnetic field to calculate the time required for an Alfven wave to travel between Io and Jupiter's ionosphere, and the period of subsequent bounces between the northern and southern hemispheres of Io. The result is a wave pattern which extends around Jupiter as the multiply reflected Alfven waves are carried away from Io by the corotating magnetospheric plasma, exhibiting a general longitudinal structure which is independent of Io's position due to magnetic field geometry and Io torus plasma distribution. If the Alfven waves simulate decametric radio emission, the wave pattern predicts specific decametric emission properties for comparison with radio observation.

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