Computer Science
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30..285a&link_type=abstract
Planetary and Space Science, vol. 30, Mar. 1982, p. 285-292.
Computer Science
12
Axial Modes, Coupled Modes, Geomagnetic Pulsations, Hall Effect, Ionospheric Conductivity, Magnetohydrodynamic Waves, Magnetospheric Instability, Plasma Resonance, Propagation Modes, Axisymmetric Flow, Extremely Low Frequencies, Fourier Series, Ionospheric Propagation, Magnetic Dipoles, Magnetosonic Resonance, Phase Velocity, Poloidal Flux, Vibration Damping
Scientific paper
An investigation of the effect of realistic ionospheric Hall conductances on the hydromagnetic wave resonance axisymmetric toroidal modes shows the modes coupling to evanescent poloidal modes near the ionosphere, such that the composite modes resonate at the constant frequencies of the corresponding single-field-shell resonances for zero Hall conductance. A composite mode model is presented whose narrow but finite latitudinal resonance widths make the modes valid solutions of the hydromagnetic equations and also the bases of the suggestion that shell solutions can describe such real pulsation properties as frequency, damping and phase variations along the field-line and node-antinode behavior at the ionosphere. It is found that magnetospheric coupling dominates ionospheric coupling for any single, non-axisymmetric mode, and estimates are obtained for the range of magnetospheric coupling strength of pulsations under a variety of conditions.
Allan W.
Knox F. B.
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