Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..537d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 537-542.
Physics
3
Atmospheric Models, Cold Plasmas, Earth Magnetosphere, Electric Fields, Magnetohydrodynamic Waves, Plasmapause, Computerized Simulation, Equatorial Regions, Plasma Oscillations
Scientific paper
It is shown that hydromagnetic wave electric fields could cause the fluctuations in cold-plasma number density that have been observed as spacecraft cross the plasmapause. To explore the effects of a hydromagnetic wave electric field on the particles in the vicinity of the plasmapause, a simple computer model of the flow of cold plasma in the equatorial plane of the magnetosphere is constructed. A hydromagnetic wave electric field which is localized in space and time is introduced. Particles are perturbed by the wave electric field. The resulting fluctuations in cold-plasma number density are most evident in the dusk region and occur over both large (about 1 earth radius) and small (about 0.1 earth radius) distance scales. As these variations in the number density are similar to those observed, hydromagnetic wave electric fields could very well account for the density variations observed in the vicinity of the plasmapause boundary.
Daly Ruth A.
Hughes Jeffrey W.
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