Publication: Theory of magnetic field line random walk in noisy reduced magnetohydrodynamic turbulence
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Issued Date
2013-01-01
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ISSN
1070664X
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2-s2.0-84873630116
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Mahidol University
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SCOPUS
Bibliographic Citation
Physics of Plasmas. Vol.20, No.1 (2013)
Suggested Citation
D. Ruffolo, W. H. Matthaeus Theory of magnetic field line random walk in noisy reduced magnetohydrodynamic turbulence. Physics of Plasmas. Vol.20, No.1 (2013). doi:10.1063/1.4789606 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/32774
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Title
Theory of magnetic field line random walk in noisy reduced magnetohydrodynamic turbulence
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Abstract
When a magnetic field consists of a mean part and fluctuations, the stochastic wandering of its field lines is often treated as a diffusive process. Under suitable conditions, a stable value is found for the mean square transverse displacement per unit parallel displacement relative to the mean field. Here, we compute the associated field line diffusion coefficient for a highly anisotropic "noisy" reduced magnetohydrodynamic model of the magnetic field, which is useful in describing low frequency turbulence in the presence of a strong applied DC mean magnetic field, as may be found, for example, in the solar corona, or in certain laboratory devices. Our approach is nonperturbative, based on Corrsin's independence hypothesis, and makes use of recent advances in understanding factors that control decorrelation over a range of parameters described by the Kubo number. Both Bohm and quasilinear regimes are identified. © 2013 American Institute of Physics.