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Current gradient-driven linear and nonlinear electromagnetic waves in a magnetized electron-positron plasma |
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| Authors: | R Bharuthram P K Shukla M Y Yu V N Pavlenko |
| Institution: | (1) Department of Physics and Astronomy, Ruhr-Universität Bochum, Bochum, F.R.G.;(2) Institute for Nuclear Research, Academy of Sciences of the Ukrainian SSR, Kiev, U.S.S.R.;(3) University of Durban-Westville, Durban, South Africa;(4) Present address: Plasma Physics Research Institute, University of Natal, Durban, South Africa |
| Abstract: | A set of coupled nonlinear differential equations which govern the dynamics of finite amplitude electromagnetic waves in the presence of an external current gradient in a magnetized electron-positron plasma has been derived. It is shown that the current gradient can make shear Alfvén-like waves unstable. A quasi-stationary solution of the mode-coupling equations is the well-localized dipole vortex. Application of our results to plasma transport in the pulsar magnetosphere is briefly discussed. |
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