Dispersion and wave coupling in inhomogeneous MHD waveguides

Details Dispersion and wave coupling in inhomogeneous MHD waveguides Dispersion and wave coupling in inhomogeneous MHD waveguides

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99..159w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p. 159-167

Physics

Plasma Physics

89

Electromagnetic Coupling, Magnetic Resonance, Magnetohydrodynamic Waves, Wave Dispersion, Wave Propagation, Waveguides, Earth Magnetosphere, Plasma Physics

Scientific paper

The propagation of the fast mode is considered in nonuniform waveguides. We show how the natural dispersion inherent in a waveguide will select waveguide modes with a small wavenumber (k(sub y)) along the guide to remain near a localized source region of fast mode energy. It is these modes that are shown to have a coherent periodic time dependence over many cycles that are suitable for driving observable Alfven resonances (magnetic pulsations). We expect the frequencies of Alfven resonances to be very close to the eigenfrequencies of waveguide modes with k(sub y) = 0.

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