Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9713777f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A9, Sept. 1, 1992, p. 13,777-13,788.
Physics
15
Coupled Modes, Earth Magnetosphere, Plasma Oscillations, Space Plasmas, Field Aligned Currents, Finite Element Method
Scientific paper
Results are presented from an eigenmode analysis of the coupled magnetohydrodynamic oscillations in the magnetosphere with a dipole magnetic field, which was carried out using the finite element method. It was found that the field-aligned current associated with the coupled global oscillations is most intense along a resonant field line. Around the resonant field line, field-aligned lower-intensity currents flow in the opposite direction. On the resonant field line, the field-aligned current has maximum intensity near the ionosphere. A radial component of the current was found to exist along the entire magnetospheric part of the resonant field line. The current flowing in the plane perpendicular to the ambient magnetic field does not form a loop and, therefore, the field-aligned component of the magnetic field perturbation is not enhanced on the resonant field line.
Fujita Shigeo
Patel Vithal L.
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