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Nonlinear propagation of partially coherent dispersive Alfvén waves.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2006 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Physica Scripta, Vol. 74, no 3, 373-376 p.Article in journal (Refereed) Published
Abstract [en]

The effects of partial coherence on the propagation of dispersive Alfvén waves in a magnetoplasma are investigated. In particular, nonlinear interactions between dispersive Alfvén waves and ion-acoustic perturbations are considered by means of a Wigner formalism. A set of governing equations consisting of a kinetic equation for dispersive Alfvén waves coupled nonlinearly to a ponderomotive force driven ion-acoustic wave equation is obtained. The governing nonlinear equations are used to derive a nonlinear dispersion relation that is appropriate for investigating the modulational instability of broadband Alfvén wavepackets. The spectral broadening of the Alfvén waves gives rise to new regimes for the growth rate of the modulational instability.

Place, publisher, year, edition, pages
INSTITUTE OF PHYSICS PUBLISHING , 2006. Vol. 74, no 3, 373-376 p.
Identifiers
URN: urn:nbn:se:umu:diva-11971DOI: 10.1088/0031-8949/74/3/013OAI: oai:DiVA.org:umu-11971DiVA: diva2:151642
Available from: 2007-03-17 Created: 2007-03-17 Last updated: 2010-09-23Bibliographically approved

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Marklund, MattiasShukla, Padma K.Stenflo, LennartLundin, Joakim

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