Standing hydromagnetic waves in the Io plasma torus - Voyager 1 observations

Details Standing hydromagnetic waves in the Io plasma torus - Voyager 1 observations Standing hydromagnetic waves in the Io plasma torus - Voyager 1 observations

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415063g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15063-15076. Research sponsored by DFG and BMFT.

Physics

34

Magnetohydrodynamic Waves, Planetary Magnetic Fields, Planetary Magnetospheres, Standing Waves, Toroidal Plasmas, Io, Jupiter (Planet), Voyager 1 Spacecraft

Scientific paper

An attempt to analyze Voyager 1 magnetic field data for the existence of any ultralow-frequency hydromagnetic waves in the Io plasma torus is presented. The coincidence between the increase in wave activity and the entry into the Io plasma torus is in support of treating the torus as a low Alfven velocity region and thus as a hydromagnetic waveguide. A first theoretical treatment of hydromagnetic wave propagation within the torus suggests that decoupling of toroidal and poloidal type oscillations can occur under the condition of axisymmetry of the wave field. Numerical calculations of the fundamental mode toroidal and first harmonic poloidal eigenperiods for a model Jovian magnetosphere give values quite in agreement with the observed periods. Observations of nearly axisymmetric, decoupled toroidal and poloidal mode eigenoscillations of the Io plasma torus suggest a large-scale source mechanism for the detected magnetic field fluctuations.

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