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Generation of sheared flows by drift waves in a strongly magnetized electron–positron–ion plasma

Published online by Cambridge University Press:  22 June 2010

NITIN SHUKLA  and
P. K. SHUKLA
NITIN SHUKLA
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden
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

It is shown that sheared/zonal flows (ZFs) can be nonlinearly excited by incoherent drift waves (DWs) in a strongly magnetized non-uniform plasma composed of electrons, positrons and ions. The dynamics of incoherent DWs in the presence of ZFs is governed by a wave-kinetic equation. The governing equation for ZFs in the presence of nonlinear forces (associated with nonlinear ion polarization and nonlinear ion-diamagnetic drifts) of the DWs is deduced by combining the Poisson equation, as well as the e-p-i continuity equations, together with appropriate plasma particle velocities in the DW and the ZF fields. Standard techniques are used to derive a nonlinear dispersion relation, which depicts two classes of the modulational instability of the DWs against the ZFs. Non-thermal ZFs can reduce the turbulent cross-field particle transport in non-uniform, strongly magnetized e-p-i plasmas.

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 3 , June 2011 , pp. 339 - 344
Copyright
Copyright © Cambridge University Press 2010

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