Waves Observed by the Galileo Spacecraft in the Io Torus

Details Waves Observed by the Galileo Spacecraft in the Io Torus Waves Observed by the Galileo Spacecraft in the Io Torus

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9q.343b&link_type=abstract

Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,

Astronomy and Astrophysics

Astrophysics

Scientific paper

Galileo magnetic field data show the existence of ion cyclotron waves in the near-Io torus. These waves are generated by anisotropies in the pickup ion distributions present in the region. To zeroth order the waves grow at the sulfur dioxide gyrofrequency, are left-hand polarized and propagate along the magnetic field. A more detailed study reveals that in some regions the waves grow over a finite bandwidth, propagate at an angle to the field and are elliptically polarized. In this work we perform a kinetic dispersion analysis for parameters consistent with the Io torus and show that while the parallel propagating SO2+ cyclotron mode has the largest growth, oblique cyclotron waves can also grow with a significant rate in the multicomponent plasma near Io. We find that decreasing the sulfur dioxide pickup ion density can lead to the observed bandwidth of frequencies.

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