Numerical modeling of hydromagnetic wave coupling in the magnetosphere

Details Numerical modeling of hydromagnetic wave coupling in the magnetosphere Numerical modeling of hydromagnetic wave coupling in the magnetosphere

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.4751i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, May 1, 1987, p. 4751-4756.

Physics

71

Computerized Simulation, Coupled Modes, Magnetohydrodynamic Waves, Magnetopause, Magnetospheric Instability, Wave Propagation, Eigenvalues, Extremely Low Radio Frequencies, Kelvin-Helmholtz Instability, Mathematical Models

Scientific paper

A simple computer code that simulates the electromagnetic response of a simplified magnetosphere with respect to pressure variations at the magnetopause is presented. The dependence of the magnetospheric response on the azimuthal wave number of the magnetopause perturbation and possible effects of a kinetic correction to the Alfven wave dispersion are investigated. The coupling of the cavity mode to Alfven oscillations is most efficient for wave numbers m = 1 . . . 3. With increasing wave number, the fundamental cavity mode may lower its eigenfrequency, opposed to the behavior of the higher-order modes. Kinetic effects cause a propagation of Alfven wave energy away from the resonant field line.

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