@inproceedings{b5f69debb6994c7eb53e7f88b717062c,
title = "Anisotropic MHD turbulence",
abstract = "The solar wind and the interstellar medium are permeated by large-scale magnetic fields that render magnetohydrodynamic (MHD) turbulence anisotropic. In the weak-turbulence limit in which three-wave interactions dominate, analytical and high-resolution numerical results based on random scattering of shear-Alfv{\'e}n waves propagating parallel to a large-scale magnetic field, as well as direct simulations demonstrate rigorously an anisotropic energy spectrum that scales as k ⊥ -2, instead of the famous Iroshnikov-Kraichnan (IK) spectrum of k -3/2 for the isotropic case. Even in the absence of a background magnetic field, anisotropy is found to develop with respect to the local magnetic field, although the energy spectrum is globally isotropic and is found to be consistent with a k -3/2 scaling. It is also found in direct numerical simulations that the energy cascade rate is much closer to IK scaling than a Kolmogorov scaling. Recent observations in the solar wind on cascade rates (as functions of the proton temperature and solar wind speed at 1 AU) seem to support this result [Vasquez et al. 2007].",
keywords = "Energy cascade, Interstellar medium, Magnetohydrodynamic turbulence, Solar wind",
author = "Ng, {C. S.} and A. Bhattacharjee",
year = "2007",
doi = "10.1063/1.2778956",
language = "English (US)",
isbn = "0735404437",
series = "AIP Conference Proceedings",
pages = "137--143",
booktitle = "TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS",
note = "TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS: 6th Annual International Astrophysics Conference ; Conference date: 16-03-2007 Through 22-03-2007",
}