Diffusion and stochastic island generation in the magnetic field line random walk

Journal Article · Sun Aug 10 00:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/791/1/56· OSTI ID:22365378

Vlad, M.; Spineanu, F. ^[1]

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1. National Institute of Laser, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele, Bucharest (Romania)

The cross-field diffusion of field lines in stochastic magnetic fields described by the 2D+slab model is studied using a semi-analytic statistical approach, the decorrelation trajectory method. We show that field line trapping and the associated stochastic magnetic islands strongly influence the diffusion coefficients, leading to dependences on the parameters that are different from the quasilinear and Bohm regimes. A strong amplification of the diffusion is produced by a small slab field in the presence of trapping. The diffusion regimes are determined and the corresponding physical processes are identified.

• OSTI ID: 22365378
• Journal Information: Astrophysical Journal, Vol. 791, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMPLIFICATION
COSMIC RADIATION
DIFFUSION
GRAPH THEORY
MAGNETIC FIELDS
MAGNETIC ISLANDS
RANDOMNESS
SOLAR WIND
STOCHASTIC PROCESSES
TRAJECTORIES
TRAPPING
TURBULENCE
TWO-DIMENSIONAL CALCULATIONS