The spatial structure of poloidal Alfven oscillations of an axisymmetric magnetosphere

Details The spatial structure of poloidal Alfven oscillations of an axisymmetric magnetosphere The spatial structure of poloidal Alfven oscillations of an axisymmetric magnetosphere

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1231l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, Oct. 1990, p. 1231-1241.

Physics

16

Earth Magnetosphere, Magnetohydrodynamics, Plasma Oscillations, Poloidal Flux, Differential Equations, Geomagnetism, Harmonics, Spatial Distribution

Scientific paper

Based on equations of ideal magnetohydrodynamics a theoretical study is made of the spatial structure of poloidal Alfven oscillations of the axisymmetric magnetosphere with large but finite values of azimuthal wave number m. The study has revealed a transverse dispersion of such oscillations which is attributable to the curvature of geomagnetic field lines that determines the fine transverse structure of the oscillation field. Solutions for different cases of the behavior of magnetospheric parameters are obtained. By taking the summation over harmonics with different m, a solution localized in both transverse coordinates which may be treated as the oscillation of a thin flux tube is constructed.

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