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Low-frequency magnetic fluctuation spectra in the magnetosheath and plasma depletion layerRecent observations have delineated several different kinds of enhanced magnetic fluctuation spectra below the proton cyclotron frequency in the terrestrial magnetosheath. A model is presented that represents the variation of plasma parameters across the plasma depletion layer and into the magnetosheath proper. Using this model, we find that many of the properties of the observed spectra follow directly from the predictions of linear Vlasov instability theory. The observed progression of spectral features is a natural progression from mirror mode to merged (in frequency range) proton and He(2+) cyclotron modes to bifurcated (in frequency range) cyclotron modes as plasma convects earthward in the magnetosheath. The necessary change in dispersion surface topology from separated proton and He(2+) cyclotron surfaces at low beta to merged surfaces at high beta is described.
Document ID
19950029548
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Denton, Richard E.
(Dartmouth College, Hanover, NH United States)
Gary, S. Peter
(Los Alamos National Laboratory, los Alamos, NM United States)
Anderson, Brian J.
(Johns Hopkins Univ. Laurel, MD, United States)
Fuselier, Stephen A.
(Lockheed Palo Alto Research Laboratory, Palo Alto, CA United States)
Hudson, Mary K.
(Dartmouth College, Hanover, NH United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: A4
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A61147
Funding Number(s)
CONTRACT_GRANT: NAGW-1652
CONTRACT_GRANT: NAS5-31213
CONTRACT_GRANT: NAG5-1098
CONTRACT_GRANT: NAS5-30565
Distribution Limits
Public
Copyright
Other

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