Abstract
The eigenfrequencies and eigenmodes of an MHD cavity in the front part of the magnetosphere and its excitation by monochromatic hydromagnetic waves incident onto the magnetosphere from solar wind are studied theoretically in the model of a plane-stratified plasma. The eigenmodes are damped due to both their absorption at the Alfvén resonance points and their emission into solar wind through the magnetopause, which is partially transparent for the excited waves. It is shown that, due to the influence of the magnetospheric cavity, the pumping of the magnetosphere by the incident waves is resonance in character. The waves penetrate into the magnetosphere only if their frequencies lie in narrow spectral ranges near the eigenfrequencies of the cavity, the width of these ranges being on the order of the damping rate of the eigenmodes. Waves with other frequencies are almost completely reflected from the magnetopause.
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Original Russian Text © V.A. Mazur, 2010, published in Fizika Plazmy, 2010, Vol. 36, No. 11, pp. 1013–1023.
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Mazur, V.A. Resonance excitation of the magnetosphere by hydromagnetic waves incident from solar wind. Plasma Phys. Rep. 36, 953–963 (2010). https://doi.org/10.1134/S1063780X10110048
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DOI: https://doi.org/10.1134/S1063780X10110048