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Earth Planets Space, Vol. 58 (No. 9), pp. 1213-1217, 2006

Kinetic effects on the parametric decays of Alfvén waves in relativistic pair plasmas

V. Muñoz1,2, T. Hada1, and S. Matsukiyo1

1Department of Earth System Science and Technology, Kyushu University, Japan
2Departamento de Física, Facultad de Ciencias, Universidad de Chile

(Received November 10, 2005; Revised April 13, 2006; Accepted April 17, 2006; Online published September 29, 2006)

Abstract: Parametric decays of a circularly polarized wave propagating along a constant magnetic field in an electron-positron plasma are studied. Fully relativistic effects on the particle velocity in the wave field are considered, as well as kinetic effects in the parallel direction, by means of a one-dimensional relativistic Vlasov equation. In this approximation, a dispersion relation is found for the parametric decays which describes the coupling between normal modes of the system, namely electromagnetic sideband modes and Langmuir waves.
Key words: Parametric decays, Alfvén waves, relativistic plasma, electron-positron plasma.


Corresponding author E-mail: vmunoz@macul.ciencias.uchile.cl


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