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Electron parallel-flow shear driven low-frequency electromagnetic modes in collisionless magnetoplasma
Umeå University, Faculty of Science and Technology, Department of Physics. Institut für Theoretische Physik IV and the Centre of Excellence for Plasma Science and Astrophysics, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Department of Physics, University of Strathclyde, Glasgow, Scotland G4ONG, UK; Centro de Física dos Plasmas, Departamento de Fisica, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisbon, Portugal; and Centre for Fundamental Physics, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, 0X11 OQX, UK.
2006 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 13, no 5, 052115Article in journal (Refereed) PublishedText
Abstract [en]

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 Ampere'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.

Place, publisher, year, edition, pages
Melville: American Institute of Physics (AIP), 2006. Vol. 13, no 5, 052115
Keyword [en]
ion-cyclotron waves, Kelvin-Helmholtz instability, field-aligned flow, velocity shear, magnetic field, acoustic waves, Q-machine, inhomogeneous plasma, auroral ionosphere, cesium plasma
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-119399DOI: 10.1063/1.2203605ISI: 000237943000016OAI: oai:DiVA.org:umu-119399DiVA: diva2:927153
Available from: 2016-05-11 Created: 2016-04-18 Last updated: 2016-05-11Bibliographically approved

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Shukla, Padma Kant
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