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          Institute: MPI für extraterrestrische Physik     Collection: Theory & Complex Plasmas     Display Documents



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ID: 12965.0, MPI für extraterrestrische Physik / Theory & Complex Plasmas
Percolation of charged particle orbits in two-dimensional irregular magnetic fields and its effect in the magnetospheric tail
Authors:Arzner, K.; Scholer, M.; Treumann, R. A.
Language:English
Date of Publication (YYYY-MM-DD):2002-04
Title of Journal:Journal of Geophysical Research A
Journal Abbrev.:J. Geophys. Res. A
Volume:107
Issue / Number:A4
Start Page:10.1029
Sequence Number of Article:1046
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:[1] This paper considers the motion of charged particles in irregular, statistically homogeneous, two-dimensional magnetic fields, a situation which might arise in multiple reconnecting current sheets and in two-dimensional MHD turbulence. The (test) particle dynamics is investigated with respect to the existence of a kinetic energy threshold, beyond which the trajectories become unbounded and effective diffusion occurs. Reformulating the Lorentz force kinematics in terms of an effective potential, the threshold problem reduces to a two- dimensional continuum percolation problem. Assuming that any realizations of A(y) (x, z) and -A(y) (x, z) appear with equal probability, a rigorous condition for unbounded trajectories in terms of the motion invariants is derived: E > 1/2 P-y(2), with epsilon the kinetic energy and P-y the canonical momentum in the invariant direction. Its validity is verified by means of Monte-Carlo simulations, and the effect of an additional electric field on particle acceleration is discussed. The percolation criterion allows conclusions about the mobility and origin of energetic particles in turbulent regions of the magnetospheric tail plasma sheet.
Free Keywords:magnetotail; charged particle motion and acceleration; transport processes
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Paul Scherrer Inst, Res Dept Particles & Matter Astrophys, CH-; 5232 Villigen, Switzerland; Max Planck Inst Extraterr Phys, Ctr Interdisciplinary Plasma Sci, D-85741 Garching, Germany
Identifiers:ISI:000178908800002
ISSN:0148-0227
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