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Excitation of zonal flows by kinetic Alfven waves
Umeå University, Faculty of Science and Technology, Department of Physics. Institut für Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92003; Innovative Science Applications and Technology, Via S. Pellico 19, Saluzzo, Italy; Centre for Interdisciplinary Plasma Science, Max-Planck Institut für Plasma Physik und extraterrestrische Physik, D-85740 Garching, Germany; GOLP, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1096 Lisboa Codex, Portugal; Centre for Fundamental Physics, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX 11 OQX, UK.
2005 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 12, no 1, 012310Article in journal (Refereed) PublishedText
Abstract [en]

Nonlinear couplings between dispersive kinetic Alfven waves (DKAWs) and electrostatic,convective cells/zonal flows are reexamined. A set of equations that exhibit nonlinear couplings between the scalar and parallel vector potentials of the DKAWs and the scalar potential of zonal flows that are reinforced by the Reynolds stresses of the DKAWs in a magnetized plasma is presented. The equations are then Fourier-analyzed to obtain the nonlinear dispersion relation. The latter exhibits modulational instabilities, which could be responsible for enhanced zonal flows in a uniform magnetized plasma. Zonal flows can regulate the transport of plasma particles in laboratory magnetoplasmas as well as in the Earth's magnetosphere and in the solar corona.

Place, publisher, year, edition, pages
Melville: American Institute of Physics (AIP), 2005. Vol. 12, no 1, 012310
Keyword [en]
Tokamak plasmas, turbulence, drift, mode
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-120457DOI: 10.1063/1.1826095ISI: 000226864500019OAI: oai:DiVA.org:umu-120457DiVA: diva2:928936
Available from: 2016-05-17 Created: 2016-05-16 Last updated: 2016-05-17Bibliographically approved

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Shukla, Padma Kant
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