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Escape of heated ions upstream of quasi-parallel shocksA simple theoretical criterion by which quasi-parallel and quasi-perpendicular collisionless shocks may be distinguished is proposed on the basis of an investigation of the free escape of ions from the post-shock plasma into the region upstream of a fast collisionless shock. It was determined that the accessibility of downstream ions to the upstream region depends on upstream magnetic field shock normal angle, in addition to the upstream plasma parameters, with post-shock ions escaping upstream for shock normal angles of less than 45 deg, in agreement with the observed transition between quasi-parallel and quasi-perpendicular shock structure. Upstream ion distribution functions resembling those of observed intermediate ions and beams are also calculated.
Document ID
19820049519
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Edmiston, J. P.
(California Univ. Los Angeles, CA, United States)
Kennel, C. F.
(California, University Los Angeles, CA, United States)
Eichler, D.
(Maryland, University College Park, MD, United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1982
Publication Information
Publication: Geophysical Research Letters
Volume: 9
Subject Category
Geophysics
Accession Number
82A33054
Funding Number(s)
CONTRACT_GRANT: NSF AST-80-02673
CONTRACT_GRANT: NSG-7341
CONTRACT_GRANT: NAS5-26257
CONTRACT_GRANT: NGL-05-007-190
Distribution Limits
Public
Copyright
Other

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