Phys. Rev. Lett. 68, 1523–1526 (1992)Effective diffusion and nonlocal heat transport in a stochastic magnetic fieldReceived 29 October 1991; published in the issue dated 9 March 1992 Heat transport in a stochastic magnetic-field configuration is investigated analytically and numerically with two complementary models: a Chirikov-Taylor map model and a Gaussian random-field model. Numerical solution of the Chirikov-Taylor model shows a short-time nonlocal regime, but at large time the Rechester-Rosenbluth effective diffusion regime is confirmed numerically. The Gaussian model, for which the associated nonlocal propagator is calculated, describes this short-time behavior. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.68.1523
DOI:
10.1103/PhysRevLett.68.1523
PACS:
52.25.Fi, 52.55.Pi
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