Resonance excitation of standing Alfven waves in an axisymmetric magnetosphere. I - Monochromatic oscillations. II - Nonstationary oscillations

Details Resonance excitation of standing Alfven waves in an axisymmetric magnetosphere. I - Monochromatic oscillations. II - Nonstationary oscillations Resonance excitation of standing Alfven waves in an axisymmetric magnetosphere. I - Monochromatic oscillations. II - Nonstationary oscillations

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1095l&link_type=abstract

Planetary and Space Science (ISSN 0032-0663), vol. 37, Sept. 1989, p. 1095-1116.

Computer Science

Sound

30

Earth Magnetosphere, Magnetohydrodynamic Waves, Nonstabilized Oscillation, Plasma Resonance, Standing Waves, Wave Excitation, Atmospheric Models, Magnetosonic Resonance, Monochromatic Radiation, Plasma Oscillations, Wave Attenuation

Scientific paper

A theoretical study of standing Alfven wave resonance excitation by a monochromatic fast magnetosound in an axisymmetric model of the magnetosphere is presented. A theory is developed which includes the Alfven and magnetosound wave relationship, transverse and longitudinal inhomogeneities of the medium, the weak transverse dispersion of Alfven waves, and their dissipation in the ionosphere. General formulas which describe the spatial structure of a monochromatic Alfven wave are derived. In addition, the excitation (in an axisymmetric magnetosphere) of standing Alfven waves by nonstationary fast magnetosound with a board spectrum of frequencies is studied theoretically. Formulas describing the space-time behavior of the Alfven waves are obtained. The important case of stochastic oscillations is considered, and examples are given which may be useful in the modeling of Pi2, SSC, and Pc3 phenomena.

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