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Drift wave driven zonal flows in electron–positron–ion plasmas

Published online by Cambridge University Press:  22 January 2010

T. D. KALADZE ,
O. A. POKHOTELOV  and
M. SHAD
T. D. KALADZE
Affiliation:
Department of Physics, Government College University, Lahore 54000, Pakistan Vekua Institute of Applied Mathematics, Tbilisi State University, 2 University Street, 0186 Tbilisi, Georgia
O. A. POKHOTELOV
Affiliation:
Institute of Physics of the Earth, Russian Academy of Sciences, 10 Bolshaya Gruzinskaya Street, Russian Federation, 123995 Moscow, Russia (O.A.Pokhotelov@sheffield.ac.uk, pokh@ifz.ru)
M. SHAD
Affiliation:
Department of Physics, Government College University, Lahore 54000, Pakistan
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Abstract

The generation of large-scale zonal flows by small-scale electrostatic drift waves in electron–positron–ion (EPI) plasma is considered. The generation mechanism is based on the parametric excitation of convective cells by finite amplitude drift waves. To describe this process, the Hasegawa–Mima equation generalized for the case of EPI plasma is used. Explicit expressions for the maximum growth rate as well as for the optimal spatial dimensions of the zonal flows are obtained. Dependence of the growth rate on the spectrum purity of the wave packet is also investigated. The relevant instability conditions are determined.

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