Waves in the Near-Io Torus

Details Waves in the Near-Io Torus Waves in the Near-Io Torus

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999baas...31.1587b&link_type=abstract

American Astronomical Society, DPS Meeting #31, late abstracts, #59.19; Bulletin of the American Astronomical Society, Vol. 31,

Astronomy and Astrophysics

Astronomy

Scientific paper

Galileo magnetic field data reveal 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 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 instabilities generated by the sulfur component in the plasma, and to the observed bandwidth of frequencies.

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