Hydromagnetic wave coupling in the magnetosphere - Plasmapause effects on impulse-excited resonances

Computer Science

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Earth Magnetosphere, Magnetohydrodynamic Waves, Plasmapause, Compression Waves, Harmonics, Plasma Resonance, Surface Waves, Time Series Analysis

Scientific paper

Recent analytical and numerical modeling has demonstrated the possibility that impulsively-stimulated compressional hydromagnetic cavity resonances can drive local field-line resonances in the magnetosphere. This paper extends the modeling to include axisymmetric plasmapause structures with realistic radial variation in the magnetospheric cavity. The results show that: (1) the plasmapause plays an important role in determining which cavity resonances are dominant; (2) when the wave fields are significantly nonaxisymmetric, additional cavity resonances are evident which are at least partly trapped within the plasmasphere; (3) the position of the plasmapause determines where (and whether) cavity resonances couple significantly to field-line resonances; and (4) for the small 'azimuthal' wavenumber chosen, there is no evidence of a compressional surface wave on the plasmapause.

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