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A new decay channel for compressional Alfven waves in plasmas
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.
2008 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 74, no 1, p. 99-105Article in journal (Refereed) Published
Abstract [en]

We present a new efficient wave decay channel involving nonlinear interactions between a compressional Alfv´en wave, a kinetic Alfv´en wave, and a modified ion sound wave in a magnetized plasma. It is found that the wave coupling strength of the ideal magnetohydrodynamic (MHD) theory is much increased when the effects due to the Hall current are included in a Hall–MHD description of wave–wave interactions. In particular, with a compressional Alfv´en pump wave well described by the ideal MHD theory, we find that the growth rate is very high when the decay products have wavelengths of the order of the ion thermal gyroradius or shorter, in which case they must be described by the Hall–MHD equations. The significance of our results to the heating of space and laboratory plasmas as well as for the Solar corona and interstellar media are highlighted.

Place, publisher, year, edition, pages
2008. Vol. 74, no 1, p. 99-105
Identifiers
URN: urn:nbn:se:umu:diva-10371DOI: 10.1017/S0022377807006599Scopus ID: 2-s2.0-38149136682OAI: oai:DiVA.org:umu-10371DiVA, id: diva2:150042
Available from: 2008-08-27 Created: 2008-08-27 Last updated: 2023-03-23Bibliographically approved

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Brodin, GertShukla, PadmaStenflo, Lennart

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