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

P. K. Shukla, B. Eliasson, M. Koepke

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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.
Original languageEnglish
Article number052115
Number of pages6
JournalPhysics of Plasmas
Volume13
Issue number5
DOIs
Publication statusPublished - 22 May 2006

Keywords

  • plasma
  • instability
  • velocity shear

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