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The role of magnetic loops in particle acceleration at nearly perpendicular shocksThe acceleration of superthermal ions is investigated when a planar shock that is on average nearly perpendicular propagates through a plasma in which the magnetic field is the superposition of a constant uniform component plus a random field of transverse hydromagnetic fluctuations. The importance of the broadband nature of the transverse magnetic fluctuations in mediating ion acceleration at nearly perpendicular shocks is pointed out. Specifically, the fluctuations are composed of short-wavelength components which scatter ions in pitch angle and long-wavelength components which are responsible for a spatial meandering of field lines about the mean field. At nearly perpendicular shocks the field line meandering produces a distribution of transient loops along the shock. As an application of this model, the acceleration of a superthermal monoenergetic population of seed protons at a perpendicular shock is investigated by integrating along the exact phase-space orbits.
Document ID
19930039171
Document Type
Reprint (Version printed in journal)
Authors
Decker, R. B. (Johns Hopkins Univ. Laurel, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A1
ISSN: 0148-0227
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-2619
CONTRACT_GRANT: N00039-91-C-0001
Distribution Limits
Public
Copyright
Other