Journal article
Voyager observations of lower hybrid noise in the Io plasma torus and anomalous plasma heating rates
The Astrophysical journal, Vol.289(1), pp.392-408
02/01/1985
DOI: 10.1086/162899
Abstract
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.
Details
- Title: Subtitle
- Voyager observations of lower hybrid noise in the Io plasma torus and anomalous plasma heating rates
- Creators
- D. D. Barbosa - California UnivF. V. Coroniti - California, UniversityW. S. Kurth - Iowa, UniversityF. L. Scarf - TRW, Inc
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.289(1), pp.392-408
- DOI
- 10.1086/162899
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Language
- English
- Date published
- 02/01/1985
- Description audience
- PUBLIC
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455580702771
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