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Self-organization in a driven dissipative plasma system

Published online by Cambridge University Press:  30 April 2009

DASTGEER SHAIKH ,
B. DASGUPTA ,
Q. HU  and
G. P. ZANK
DASTGEER SHAIKH
Affiliation:
Department of Physics, University of Alabama at Huntsville, Huntsville, AL 35805, USA ([email protected]) Center for Space Physics and Aeronomic Research (CSPAR), University of Alabama at Huntsville, Huntsville, AL 35805, USA
B. DASGUPTA
Affiliation:
Center for Space Physics and Aeronomic Research (CSPAR), University of Alabama at Huntsville, Huntsville, AL 35805, USA
Q. HU
Affiliation:
Center for Space Physics and Aeronomic Research (CSPAR), University of Alabama at Huntsville, Huntsville, AL 35805, USA
G. P. ZANK
Affiliation:
Department of Physics, University of Alabama at Huntsville, Huntsville, AL 35805, USA ([email protected]) Center for Space Physics and Aeronomic Research (CSPAR), University of Alabama at Huntsville, Huntsville, AL 35805, USA
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Abstract

We perform a fully self-consistent three-dimensional numerical simulation for a compressible, dissipative magnetoplasma driven by large-scale perturbations, that contain a fairly broad spectrum of characteristic modes, ranging from largest scales to intermediate scales and down to the smallest scales, where the energy of the system is dissipated by collisional (ohmic) and viscous dissipations. Additionally, our simulation includes nonlinear interactions amongst a wide range of fluctuations that are initialized with random spectral amplitudes, leading to the cascade of spectral energy in the inertial range spectrum, and takes into account large-scale as well as small-scale perturbations that may have been induced by the background plasma fluctuations, as well as the non-adiabatic exchange of energy leading to the migration of energy from the energy-containing modes or randomly injected energy driven by perturbations and further dissipated by the smaller scales. Besides demonstrating the comparative decays of the total energy and the dissipation rate of the energy, our results show the existence of a perpendicular component of the current, thus clearly confirming that the self-organized state is non-force free.

Type
Papers
Information
Journal of Plasma Physics , Volume 76 , Issue 1 , February 2010 , pp. 107 - 116
Copyright
Copyright © Cambridge University Press 2009

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