Physics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3219s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A3, March 1, 1992, p. 3219-3222.
Physics
8
Cold Plasmas, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Nonuniform Plasmas, Resonance Lines, Standing Waves, Eigenvectors, Magnetic Field Configurations, Plasma Density, Resonant Frequencies, Satellite Observation, Three Dimensional Models
Scientific paper
Field line resonances of Alfven waves in a rectangular box model with a straight uniform magnetic field but three-dimensionally varying density are analyzed. Field line resonances are shown to exist even with this nonuniformity. For a given wave frequency the surface on which the resonance occurs and can be constructed, to the local form of the singular solution derived. Magnetic perturbations are found to lie predominantly in the resonant surface. In the presence of azimuthal inhomogeneities the present theory could explain why some satellite measurements show geomagnetic pulsations of comparable magnitude in radial and azimuthal components.
Chen Liu
Gowley Steven
Schulze-Berge Sibylle
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