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Title: Magnetohydrodynamic turbulence in a strongly magnetised plasma
Authors: Sridhar, S.
Keywords: magnetohydrodynamics (MHD)
Issue Date: 28-Dec-2009
Publisher: WILEY-VCH Verlag GmbH & Co
Citation: Astronomische Nachrichten, 2010, Vol.331, p93
Abstract: I present a review of incompressible magnetohydrodynamic (MHD) turbulence in a strongly magnetised plasma. The approach is phenomenological even where a more rigorous theory is available, so that a reader armed with paper, pencil and some determination may be able to work through most of the physics. The focus is on the inertial-range spectra for very large (fluid and magnetic) Reynolds numbers. These theories of the inertial-range are built on two important facts: (i) Kraichnan's insight that the turbulent cascades are a result of nonlinear interactions between oppositely directed wavepackets of Elsasser fields; (ii) these oppositely directed wavepackets do not exchange energy, but contribute only to changing each other's spatial structures. I begin with a description and critique of the Iroshnikov-Kraichnan theory, and explore the fundamental departures necessitated by the anisotropic nature of the turbulence. Derivations of the inertial-range spectra of four regimes of MHD turbulence - the balanced weak, balanced strong, imbalanced weak and the imbalanced strong cascades - are then presented. The need for studying the spectra of imbalanced turbulence when the waves on the outer scale have a short correlation time is briefly discussed
Description: Restricted Access.
ISSN: 1521-3994 (Online)
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Copyright: 2010 WILEY-VCH Verlag GmbH & Co.
Additional information: An open-access version is available at (one of the alternative locations)
Appears in Collections:Research Papers (A&A)

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