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Title: | Magnetohydrodynamic turbulence in a strongly magnetised plasma |
Authors: | Sridhar, S. |
Keywords: | magnetohydrodynamics (MHD) turbulence |
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. |
URI: | http://hdl.handle.net/2289/3905 |
ISSN: | 1521-3994 (Online) 0004-6337 |
Alternative Location: | http://adsabs.harvard.edu/abs//2009arXiv0911.2581S http://arxiv.org/abs/0911.2581 http://dx.doi.org/10.1002/asna.200911306 |
Copyright: | 2010 WILEY-VCH Verlag GmbH & Co. |
Additional information: | An open-access version is available at arXiv.org (one of the alternative locations) |
Appears in Collections: | Research Papers (A&A) |
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2010_Astronomische_N_V331_p93.pdf Restricted Access | Restricted Access | 148.3 kB | Adobe PDF | View/Open Request a copy |
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