Electron parallel-flow shear driven low-frequency electromagnetic modes in collisionless magnetoplasma

Shukla, P. K. and Eliasson, B. and Koepke, M. (2006) Electron parallel-flow shear driven low-frequency electromagnetic modes in collisionless magnetoplasma. Physics of Plasmas, 13 (5). ISSN 1070-664X

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Abstract

The free energy associated with shear in the equilibrium parallel electron velocity is shown to be responsible for the excitation of low-frequency electromagnetic waves in collisionless magnetoplasma. New dispersion relations are derived by using the hydrodynamic equations for the electron fluid, the magnetic-field-aligned (parallel) drift of which varies in one of the perpendicular directions, and by using a kinetic ion model, together with Ampère’s law and Poisson’s equation. The dispersion relations are analyzed both analytically and numerically for a set of parameters representative of a laboratory experiment. New filamentary instabilities are predicted.