Electromagnetic ion-cyclotron instability in the multi-ion Jovian magnetosphere

Details Electromagnetic ion-cyclotron instability in the multi-ion Jovian magnetosphere Electromagnetic ion-cyclotron instability in the multi-ion Jovian magnetosphere

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..631t&link_type=abstract

(Chapman Conference on Waves in Magnetospheric Plasmas, Kona, HI, Feb. 1983) Geophysical Research Letters (ISSN 0094-8276), vol.

Physics

27

Electromagnetic Wave Transmission, Ion Cyclotron Radiation, Jupiter Atmosphere, Magnetospheric Instability, Magnetospheric Ion Density, Planetary Magnetospheres, Heavy Ions, Io, Propagation Modes, Jupiter, Magnetosphere, Electromagnetic Effects, Ions, Waves, Io, Plasma, Torus, Equatorial Regions, Amplitude, Diffusion, Damping, Parameters, Voyager Missions, Plasma Wave Instrument, Density, Observations, Intensity, Emissions, Calculations

Scientific paper

The sensitivity to relative thermal ion composition of electromagnetic ion-cyclotron wave propagation characteristics may control the instability properties of resonant energetic ions in the Jovian magnetosphere. While the dominance of heavy ions in the Io plasma torus will suppress ion-cyclotron instability near the equatorial plane, wave growth may still occur in those regions where thermal hydrogen predominates. While an assessment of the convective L-mode gain shows that Voyager 1 did not enter the preferred instability region, evidence for instability may be obtained if oblique ion-cyclotron waves experience a natural polarization reversal to the R-mode which is able to propagate from high latitudes to the equator. In the absence of significant Landau damping, the power spectral density of fluctuating R-mode electric fields near the equatorial plane would then exceed 10 to the -7th (V/m)-squared/Hz in the inner torus.

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