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Stabilization of magnetic curvature-driven Rayleigh–Taylor instabilities

Published online by Cambridge University Press:  01 November 2011

O. G. ONISHCHENKO ,
O. A. POKHOTELOV ,
L. STENFLO  and
P. K. SHUKLA
O. G. ONISHCHENKO
Affiliation:
Institute of Physics of the Earth, 10 B. Gruzunskaya Street, 123995 Moscow, Russia (pokh@ifz.ru) Space Research Institute, 84/32 Profsojuznaya Street, 117997 Moscow, Russia
O. A. POKHOTELOV
Affiliation:
Institute of Physics of the Earth, 10 B. Gruzunskaya Street, 123995 Moscow, Russia (pokh@ifz.ru)
L. STENFLO
Affiliation:
Department of Physics, Linköping University, SE-58183 Linköping, Sweden
P. K. SHUKLA
Affiliation:
Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr–Universität Bochum, D–44780 Bochum, Germany
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Abstract

The finite ion Larmor radius (FLR) stabilization of the magnetic curvature-driven Rayleigh–Taylor (MCD RT) instability in a low beta plasma with nonzero ion temperature gradient is investigated. Finite electron temperature effects and ion temperature perturbations are incorporated. A new set of nonlinear equations for flute waves with arbitrary wavelengths as compared with the ion Larmor radius in a plasma with curved magnetic field lines is derived. Particular attention is paid to the waves with spatial scales of the order of the ion Larmor radius. In the linear limit, a Fourier transform of these equations yields an improved dispersion relation for flute waves. The dependence of the MCD RT instability growth rate on the equilibrium plasma parameters and the wavelengths is studied. The condition for which the instability cannot be stabilized by the FLR effects is found.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Issue 1 , February 2012 , pp. 93 - 97
Copyright
Copyright © Cambridge University Press 2011

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