Journal article
Superthermal electrons and Bernstein waves in Jupiter's inner magnetosphere
Journal of Geophysical Research, Wash., D.C, Vol.85(A12), pp.6729-6742
12/01/1980
DOI: 10.1029/JA085iA12p06729
Abstract
A theoretical model for generation of banded electrostatic emissions by low-density, superthermal electrons is developed for application to Jupiter's magnetosphere. The model uses a power law form for the energy dependence and a loss cone pitch-angle distribution of superthermals to drive convective instability of Bernstein modes. The authors concentrate on instability in the upper hybrid band and on lower harmonic bands below the upper hybrid frequency. A direct correspondence between spectral features of the 3/2's band and resonant superthermal electrons is found. The concept of a critical flux, j<<SUB perpendicular >> *, of resonant electrons able to provide 10 e-foldings of electric field amplification yields an explicit relation, j<<SUB perpendicular >> * similar to p, in terms of the background thermal electron pressure. This result is used to construct a theoretical-empirical model of thermal electron density and temperature from 6-20 R sub(j) in the Jovian magnetosphere, which suggests that the ion and electron temperatures satisfy T sub(e) < T sub(i) similar to 10T sub(e) in this region. Wave ray paths are computed for propagation in the magnetic equator and in the magnetic meridional plane of a dipole magnetic field. These ray paths suggest that intense wave activity is tightly confined to a small latitudinal extent, Lambda < approximately plus or minus 4 degrees . about the magnetic equator.
Details
- Title: Subtitle
- Superthermal electrons and Bernstein waves in Jupiter's inner magnetosphere
- Creators
- D Barbosa - Planetary Science InstituteW Kurth - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Journal of Geophysical Research, Wash., D.C, Vol.85(A12), pp.6729-6742
- DOI
- 10.1029/JA085iA12p06729
- ISSN
- 0148-0227
- eISSN
- 2156-2202
- Language
- English
- Date published
- 12/01/1980
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984454342202771
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