Voyager observations of lower hybrid noise in the Io plasma torus and anomalous plasma heating rates

Details Voyager observations of lower hybrid noise in the Io plasma torus and anomalous plasma heating rates Voyager observations of lower hybrid noise in the Io plasma torus and anomalous plasma heating rates

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..392b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 392-408.

Physics

Plasma Physics

24

Io, Plasma Heating, Plasma Waves, Plasma-Particle Interactions, Toroidal Plasmas, Electric Fields, Electrical Measurement, Heat Transfer, Jupiter Satellites, Planetology, Plasma Physics, Voyager 1 Spacecraft, Jupiter, Satellites, Io, Voyager Missions, Observations, Plasma Torus, Heating, Electric Fields, Plasma Wave Instrument, Analysis, Spectra, Noise, Sulfur, Oxygen, Waves, Intensity, Doppler Observations, Ions, Theoretical Studies, Distribution, Models, Density, Electrons

Scientific paper

A study of Voyager 1 electric field measurements obtained by the plasma wave instrument in the Io plasma torus has been carried out. A survey of the data has revealed the presence of persistent peaks in electric field spectra in the frequency range 100-600 Hz consistent with their identification as lower hybrid noise for a heavy-ion plasma of sulfur and oxygen. Typical wave intensities are 0.1 mV/m, and the spectra also show significant Doppler broadening, Delta omega/omega approximately 1. A theoretical analysis of lower hybrid wave generation by a bump-on-tail ring distribution of ions is given. The model is appropriate for plasmas with a superthermal pickup ion population present. A general methodology is used to demonstrate that the maximum plasma heating rate possible through anomalous wave-particle heat exchange is less than approximately 10 to the -14th ergs per cu cm per s. Although insufficient to meet the power requirement of the EUV-emitting warm torus, the heating rate is large enough to maintain a low-density (0.01-0.1 percent) superthermal electron population of keV electrons, which may lead to a small but significant anomalous ionization effect.

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