Magnetic Field Line Transport in Anisotropic Magnetic Turbulence: Anomalous, Quasilinear, and Percolative Regimes Versus the Kubo Number
Authors: Zimbardo, G.; Veltri, P.; Pommois, P.
Source: Astrophysics and Space Science, Volume 277, Numbers 1-2, 2001 , pp. 101-102(2)
Abstract:The transport of plasma and of energetic particles because of magnetic turbulence is relevant to many space plasmas, ranging from the planetary magnetospheres to the solar corona and to the heliosphere. Various transport regimes for magnetic field lines can be obtained depending on the Kubo number. Here we show, by means of a numerical simulation, that the Kubo number also determines the level of chaos of the field lines. Weak chaos, closed magnetic surfaces, and anomalous transport regimes are obtained for R≪ 1; widespread chaos, destroyed magnetic surfaces, and quasilinear scaling of the diffusion coefficient for R ≳ 0.3; and global stochasticity as well as percolation scaling of the diffusion coefficient for R≫ 1.
Document Type: Regular Paper
Affiliations: Dipartimento di Fisica, Università della Calabria and Istituto Nazionale di Fisica della Materia, Unità di Cosenza, 87036 Arcavacata di Rende CS, Italy
Publication date: 2001-01-01