Physics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..665p&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, May 1990, p. 665-673.
Physics
5
Ionospheric Ion Density, Magnetohydrodynamic Waves, Nonuniform Plasmas, Oxygen Ions, Plasmasphere, Standing Waves, Eigenvalues, F Region, Geomagnetic Latitude
Scientific paper
At geomagnetic latitudes well within the plasmasphere (about 25-40 deg), ionospheric O(+) ions have a significant effect on hydromagnetic wave frequencies, waveforms and wave mode coupling. A physically realistic plasmasphere model is here applied to obtain the eigenfunctions of the toroidal mode standing waves in a dipole field. Ion mass density inhomogeneities along the field lines result in a confinement of the wave fields within any significant density increase. Near latitude 30 deg the fundamental toroidal mode electric field has its largest values well away from the equatorial plane. The effects of the ionospheric F-region need to be considered when mapping pulsation fields and evaluating hydromagnetic wave coupling at low latitudes. The irregular spacing of the toroidal mode harmonic frequencies near latitude 30 deg is a direct consequence of the Alfven velocity inhomogeneity over a substantial portion of the field line length.
Allan W.
Bailey Graham J.
Poulter E. M.
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