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Particle acceleration at shocks with surface ripplesThe present treatment of superthermal-ion acceleration on the surface of a fast-mode hydromagnetic shock gives attention to (1) small-amplitude surface ripples characterized by width L and amplitude A that are large relative to the energetic-ion gyroradius, and (2) shocks which are on average quasi-perpendicular. An investigation is made of the effects of the confinement, evolving geometry, and finite shock curvature associated with the ripple, by integrating along the orbits of the proton test particles. As an upstream magnetic field line convects through the surface ripple, it intersects the shock at two points, thereby forming a temporary magnetic trap. Flux-line profiles and angular distributions in a given ripple differ substantially, depending on the path it takes through the ripple and its distance from the shock.
Document ID
19900057455
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Decker, R. B.
(Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Space Radiation
Accession Number
90A44510
Funding Number(s)
CONTRACT_GRANT: NSF ATM-86-1135
CONTRACT_GRANT: NAGW-1578
CONTRACT_GRANT: N00039-89-C-5301
Distribution Limits
Public
Copyright
Other

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