Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4589s&link_type=abstract
Journal of Geophysical Research, vol. 86, June 1, 1981, p. 4589-4596.
Physics
150
Earth Magnetosphere, Geomagnetic Pulsations, Magnetic Field Configurations, Magnetohydrodynamic Waves, Plasma Resonance, Space Plasmas, Cold Plasmas, Collisionless Plasmas, Linear Equations, Magnetic Dipoles, Poloidal Flux, Standing Waves, Toroidal Plasmas, Transverse Waves, Wave Propagation
Scientific paper
A calculation is conducted of long-period ultra-low-frequency (ULF) magnetospheric pulsations, taking into account a realistic earth's magnetic field geometry rather than a simple dipole field. The linearized transverse wave equation for low-frequency propagation in a cold, collisionless magnetized plasma is solved. Solutions are obtained for the symmetric toroidal and highly asymmetric poloidal mode standing wave oscillations in both dipole and Olson-Pfitzer field models. The realistic description of the earth's field given by the Olson-Pfitzer model leads to substantial differences in eigenfrequencies from those determined by using dipole models. The described model is most important for studying oscillations on field lines which extend to large radial distances where large deviations from a dipole configuration occur.
Galland Kivelson Margaret
Singer Howard J.
Southwood David J.
Walker Ray J.
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