Wave modes of the Io plasma torus

Details Wave modes of the Io plasma torus Wave modes of the Io plasma torus

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..678s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 678-684.

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Computation

19

Computational Astrophysics, Io, Plasma Waves, Propagation Modes, Satellite Atmospheres, Toroidal Plasmas, Astronomical Models, Earth Magnetosphere, Jupiter Atmosphere, Jupiter Satellites, Magnetohydrodynamic Stability, Magnetosphere-Ionosphere Coupling, Plasma Dynamics, Wave Propagation

Scientific paper

The corotating magnetospheric convection model is analyzed with the objective of deriving the fundamental wave modes present in the Io torus. The time-dependent equations of motion are linearized for the case of the absence of plasma mass and momentum sources. By separating the magnetosphere-ionosphere coupling equation into two equations and by adopting a specific analytic form for the equilibrium plasma density, a cubic equation is derived for the dispersion relation defining the angular frequencies of the fundamental wave modes. A detailed analysis of the dispersion relation yields three fundamental wave modes. One of the modes is identified as the previously studied inertial interchange (unstable) mode, while the other two are newly derived decaying modes. The results obtained are discussed in the context of plasma transport in the Io torus.

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