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Kinetic dissipation and anisotropic heating in a turbulent collisionless plasma

Phys. Plasmas 16, 032310 (2009); doi:10.1063/1.3094062

Published 30 March 2009

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T. N. Parashar, M. A. Shay, P. A. Cassak, and W. H. Matthaeus
Department of Physics and Astronomy, 217 Sharp Laboratory, University of Delaware, Newark, Delaware 19716, USA
The kinetic evolution of the Orszag–Tang vortex is studied using collisionless hybrid simulations. In magnetohydrodynamics (MHD) this configuration leads rapidly to broadband turbulence. At large length scales, the evolution of the hybrid simulations is very similar to MHD, with magnetic power spectra displaying scaling similar to a Kolmogorov scaling of −5/3. At small scales, differences from MHD arise, as energy dissipates into heat almost exclusively through the magnetic field. The magnetic energy spectrum of the hybrid simulation shows a break where linear theory predicts that the Hall term in Ohm's law becomes significant, leading to dispersive kinetic Alfvén waves. A key result is that protons are heated preferentially in the plane perpendicular to the mean magnetic field, creating a proton temperature anisotropy of the type observed in the corona and solar wind. ©2009 American Institute of Physics
History: Received 14 October 2008; accepted 12 February 2009; published 30 March 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/032310/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.30.Cv
    Plasma magnetohydrodynamics
  • 52.65.Kj
    Magnetohydrodynamic and fluid equation (plasma simulation)
  • 52.25.Dg
    Plasma kinetic equations
  • 52.35.Bj
    Plasma magnetohydrodynamic waves
  • 52.35.Ra
    Plasma turbulence
  • 52.50.Lp
    Plasma production and heating by shock waves and compression
  • 52.65.Ww
    Hybrid methods (plasma simulation)
  • 52.35.Hr
    Plasma electromagnetic waves
  • 52.80.Hc
    Glow; corona discharges
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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