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Charged-particle motion in multidimensional magnetic-field turbulenceWe present a new analysis of the fundamental physics of charged-particle motion in a turbulent magnetic field using a numerical simulation. The magnetic field fluctuations are taken to be static and to have a power spectrum which is Kolmogorov. The charged particles are treated as test particles. It is shown that when the field turbulence is independent of one coordinate (i.e., k lies in a plane), the motion of these particles across the magnetic field is essentially zero, as required by theory. Consequently, the only motion across the average magnetic field direction that is allowed is that due to field-line random walk. On the other hand, when a fully three-dimensional realization of the turbulence is considered, the particles readily cross the field. Transport coefficients both along and across the ambient magnetic field are computed. This scheme provides a direct computation of the Fokker-Planck coefficients based on the motions of individual particles, and allows for comparison with analytic theory.
Document ID
19950029905
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Giacalone, J.
(Univ. of Arizona, Tucson, AZ United States)
Jokipii, J. R.
(Univ. of Arizona, Tucson, AZ United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1994
Publication Information
Publication: The Astrophysical Journal
Volume: 430
Issue: 2 pt
ISSN: 0004-637X
Subject Category
Plasma Physics
Accession Number
95A61504
Funding Number(s)
CONTRACT_GRANT: NAGW-1931
CONTRACT_GRANT: NSF ATM-93-07046
CONTRACT_GRANT: NAG5-2251
Distribution Limits
Public
Copyright
Other

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