Coupling instability of the shear Alfven wave in the magnetosphere with the ionospheric ion drift wave. I - Energetic consideration

Details Coupling instability of the shear Alfven wave in the magnetosphere with the ionospheric ion drift wave. I - Energetic consideration Coupling instability of the shear Alfven wave in the magnetosphere with the ionospheric ion drift wave. I - Energetic consideration

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..905t&link_type=abstract

Journal of Geophysical Research, vol. 87, Feb. 1, 1982, p. 905-911.

Computer Science

Numerical Analysis

7

Electric Fields, Ionospheric Drift, Magnetohydrodynamic Waves, Magnetospheric Instability, Ohmic Dissipation, Coordinates, Ionospheric Electron Density, Magnetic Flux, Magnetosphere-Ionosphere Coupling, Maxwell Equation, Numerical Analysis, Poynting Theorem, S Waves

Scientific paper

It is demonstrated that the negative ohmic dissipation associated with the ion drift wave in the ionosphere in the presence of a large-scale stationary electric field results in a shear Alfven instability in the magnetosphere. A criterion of the instability is derived from simple energetic considerations which require the reverse sign of the perturbed electric field in the ionosphere in comparison with that at the equator. In fact, numerical solutions of the eigen-mode oscillations in realistic ionosphere-magnetosphere coupling system suggest such a change of sign between the two and also yield an upward field-aligned Poynting flux from the ionosphere for the unstable oscillations, while for the damping oscillations there is the downward energy flow along a field line.

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