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Simulations of two-dimensional magnetic electron drift vortex mode turbulence in plasmas

Published online by Cambridge University Press:  01 February 2009

DASTGEER SHAIKH  and
P. K. SHUKLA
DASTGEER SHAIKH
Affiliation:
Institute of Geophysics and Planetary Physics (IGPP), University of California, Riverside, CA 92521, USA ([email protected])
P. K. SHUKLA
Affiliation:
Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany ([email protected])
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Abstract

Simulations are performed to investigate the turbulent properties of nonlinearly interacting two-dimensional magnetic electron drift vortex (MEDV) modes in a non-uniform unmagnetized plasma. The relevant nonlinear equations governing the dynamics of the MEDV modes are the wave magnetic field and electron temperature perturbations in the presence of the equilibrium density and temperature gradients. The important nonlinearities come from the advection of the electron fluid velocity perturbation and the electron temperature, as well as from the nonlinear electron Lorentz force. Computer simulations of the governing equations for the nonlinear MEDV modes reveal the generation of streamer-like electron flows, such that the corresponding gradients in the direction of the inhomogeneities tend to flatten out. In contrast, the gradients in an orthogonal direction vary rapidly. Consequently, the inertial range energy spectrum in decaying MEDV mode turbulence exhibits a much steeper anisotropic spectral index. The magnetic structures in the MEDV mode turbulence produce non-thermal electron transport in our non-uniform plasma.

Type
Papers
Information
Journal of Plasma Physics , Volume 75 , Issue 1 , February 2009 , pp. 133 - 144
Copyright
Copyright © Cambridge University Press 2008

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