Modulational and decay instabilities of Alfvén waves in a multicomponent plasma

Details Modulational and decay instabilities of Alfvén waves in a multicomponent plasma Modulational and decay instabilities of Alfvén waves in a multicomponent plasma

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10902103h&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A2, CiteID A02103

Physics

Plasma Physics

9

Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Interplanetary Dust

Scientific paper

The parallel propagating transverse modes in a plasma are known to be exact solutions of the MHD and multifluid equations. Here we investigate these waves in a multicomponent plasma consisting of two ion-like species, which are allowed to be fully mobile. In this paper we perturb these exact solutions and investigate modulational or decay instabilities where the pump wave is modified by the daughter waves in regions of instability. In a warm plasma, the parallel modes can interact with transverse and acoustic modes. A tenth-degree polynomial dispersion equation is obtained, describing the interaction of the pump with two acoustic modes and sideband-beat-waves. In the low-temperature regime the effect of a second ion species is to reduce the usual modulational instability, and a new decay instability arises. In the high-temperature regime, two new decay instabilities, narrow in wave number, are found. All of these instabilities involve the additional modes associated with the introduction of a second heavy species.

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