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Plasma convection and ion beam generation in the plasma sheet boundary layerBecause of the dawn-dusk electric field E(dd), plasma in the magnetotail convects from the lobe toward the central plasma sheet (CPS). In the absence of space or velocity diffusion due to plasma turbulence, convection would yield a steady state distribution function f = V exp (-2/3) g(v exp 2 V exp 2/3), where V is the flux tube volume. Starting with such a distribution function and a plasma beta which varies from beta greater than 1 in the CPS to beta much smaller than 1 in the lobe, the evolution of the ion distribution function was studied considering the combined effects of ion diffusion by kinetic Alfven waves (KAW) in the ULF frequency range (1-10 mHz) and convection due to E(dd) x B drift in the plasma sheet boundary layer (PSBL) and outer central plasma sheet (OCPS). The results show that, during the early stages after launching the KAWs, a beamlike ion distribution forms in the PSBL and at the same time the plasma density and temperature decrease in the OCPS. Following this stage, ions in the beams convect toward the CPS resulting in an increase of the plasma temperature in the OCPS.
Document ID
19910040943
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Moghaddam-Taaheri, E.
(Iowa Univ. Iowa City, IA, United States)
Goertz, C. K.
(Iowa Univ. Iowa City, IA, United States)
Smith, R. A.
(Iowa, University Iowa City, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
91A25566
Funding Number(s)
CONTRACT_GRANT: NAGW-970
Distribution Limits
Public
Copyright
Other

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