Convective filamentation instability of circularly polarized Alfven waves

Details Convective filamentation instability of circularly polarized Alfven waves Convective filamentation instability of circularly polarized Alfven waves

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phflb...1..734k&link_type=abstract

Physics of Fluids B (ISSN 0899-8221), vol. 1, April 1989, p. 734-740.

Physics

10

Circular Polarization, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Space Plasmas, Coupled Modes, Plasma Composition, Plasma Diagnostics

Scientific paper

A convective instability that leads to the filamentation of large-amplitude Alfven waves and generates nonoscillatory spatially growing density fluctuations is investigated by using a two-fluid plasma model. Based on linear perturbation analysis for a four-wave parametric coupling process, the dispersion relations of the instability for both a right- and left-hand circularly polarized Alfven pump are derived. They are then solved numerically for the dependences of the threshold fields and growth rates on the wavenumber of the nonoscillatory mode, the beta of the plasma, and the frequency of the pumps. The relevance of the proposed instability for observations of space plasmas is discussed.

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