Physics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.7954g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, July 1, 1986, p. 7954-7960. Research supported by the Israel Academy
Physics
10
Heavy Ions, Jupiter (Planet), Magnetohydrodynamic Waves, Oxygen Ions, Sulfur, Wave Excitation, Anisotropy, Planetary Magnetic Fields, Resonance, Voyager 1 Spacecraft, Wave Propagation
Scientific paper
Large fluxes of heavy ions have been reported upstream of Jupiter's bow shock as Voyager 1 approached the planet. Enhanced low-frequency magnetic wave activity was also observed during the particle events. The fluctuations are left-hand elliptically polarized in the plasma frame. The spectrum of these fluctuations contains a peak close to the Doppler-shifted resonance frequency of a sulfur or oxygen beam with streaming energy of approximately 30 keV. These fluctuations are also present in the spectrum of the magnitude of the field. The authors conclude that the observations result from an instability driven by an energetic beam of either sulfur or oxygen. The wave observations can be described by a heavy ion distribution with both a streaming anisotropy and a temperature anisotropy (T|/T∥ ≅ 2). This class of heavy ion streaming instabilities may also play a role in wave-particle interactions in the vicinity of comets.
Eviatar Aharon
Goldstein Michel L.
Wong Hung K.
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