Giant pulsations in the plasmasphere

Details Giant pulsations in the plasmasphere Giant pulsations in the plasmasphere

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1155g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Oct. 1985, p. 1155-1168.

Computer Science

15

Auroral Zones, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Magnetospheric Instability, Plasmasphere, Magnetometers, Wave Propagation

Scientific paper

It has been generally accepted up to now that giant pulsations (Pg) are auroral zone phenomena, but here observations are presented of a sequence of three Pg events on successive days at three stations well within the plasmasphere. Field line resonance behavior is exhibited, with one of the events clearly resonating at L of about 2.8. From the resonant frequency, equatorial mass densities are calculated and from these and the measured azimuthal polarization at resonance, the inference is drawn that Pgs are oscillations in the fundamental guided poloidal mode. It is suggested that the drift wave instability of the compressional Alfven wave may be the source mechanism for Pgs, and it is speculated how conditions for the instability may have arisen.

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