Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....8810035n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 10035-10040.
Physics
14
Compression Waves, Magnetohydrodynamic Waves, Magnetospheric Instability, Plasma Slabs, S Waves, Beta Particles, Geomagnetic Pulsations, Geomagnetism, Magnetohydrodynamic Stability, Plasma Drift
Scientific paper
An investigation is described of the coupling of the compressional instability to the shear Alfven wave in a slab geometry with straight field lines. The local approximation, assumed to be valid, is used in the derivation of the dispersion relation. The lowest order effect of the field inhomogeneity is incorporated into the dispersion relation by retaining the grad B drift in the particle's unperturbed orbit. It is found that the high parallel phase velocity compressional mode (with omega/k(parallel) greater than V(parallel) sub i) shows insignificant coupling to the shear Alfven wave. In contrast, the low phase velocity branch exhibits significant coupling. In addition, the form that the coupling factor takes in the long wavelength limit is given.
Ng Pun-Hon
Patel Vithal L.
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