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The propagation and growth of whistler mode waves generated by electron beams in earth's bow shockIn this study, the propagation and growth of whistler mode waves generated by electron beams within earth's bow shock is investigated using a planar model for the bow shock and a model electron distribution function. Within the shock, the model electron distribution function possesses a field-aligned T greater than T beam that is directed toward the magnetosheath. Waves with frequencies between about 1 and 100 Hz with a wide range of wave normal angles are generated by the beam via Landau and anomalous cyclotron resonances. However, because the growth rate is small and because the wave packets traverse the shock quickly, these waves do not attain large amplitudes. Waves with frequencies between about 30 and 150 Hz with a wide range of wave normal angles are generated by the beam via the normal cyclotron resonance. The ray paths for most of these waves are directed toward the solar wind although some wave packets, due to plasma convection travel transverse to the shock normal. These wave packets grow to large amplitudes because they spend a long time in the growth region. The results suggest that whistler mode noise within the shock should increase in amplitude with increasing upstream theta sub Bn. The study provides an explanation for the origin of much of the whistler mode turbulence observed at the bow shock.
Document ID
19850036962
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tokar, R. L.
(Los Alamos National Laboratory, Los Alamos, NM; Iowa, University Iowa City, IA, United States)
Gurnett, D. A.
(Los Alamos Scientific Lab. NM, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Journal of Geophysical Research
Volume: 90
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
85A19113
Funding Number(s)
CONTRACT_GRANT: N00014-76-C-0016
CONTRACT_GRANT: NGL-16-001-043
CONTRACT_GRANT: NAS5-26819
Distribution Limits
Public
Copyright
Other

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