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Basic properties of magnetohydrodynamic turbulence in the inertial range

Authors

  • Andrey Beresnyak

    Corresponding author
    1. Los Alamos National Laboratory, Los Alamos, NM 87545, USA
    2. Ruhr-Universität Bochum, 44780 Bochum, Germany
      E-mail: andrey.at.astro@gmail.com
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E-mail: andrey.at.astro@gmail.com

ABSTRACT

We revisit the issue of the spectral slope of magnetohydrodynamic (MHD) turbulence in the inertial range and argue that the numerics favour a Goldreich–Sridhar −5/3 slope rather than a −3/2 slope. We also perform precision measurements of the anisotropy of MHD turbulence and determine the anisotropy constant CA= 0.34 of Alfvénic turbulence. Together with the previously measured Kolmogorov constant CK= 4.2, or 3.3 for a purely Alfvénic case, it constitutes a full description of the MHD cascade in terms of spectral quantities, which is of high practical value for astrophysics.

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