Long period hydromagnetic wave inside the plasmasphere

Details Long period hydromagnetic wave inside the plasmasphere Long period hydromagnetic wave inside the plasmasphere

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.1703s&link_type=abstract

Journal of Geophysical Research, vol. 87, Mar. 1, 1982, p. 1703-1706.

Physics

8

Magnetohydrodynamic Waves, Periodic Variations, Plasma Waves, Plasmasphere, Whistlers, Heavy Ions, Hydrogen Plasma, Monochromatic Radiation, Northern Hemisphere

Scientific paper

A long period (approximately 6 min) hydromagnetic wave was observed, near L of about 4 in the southern hemisphere at both Hally Bay and Siple, Antarctica, to have a substantially larger amplitude than that observed in the northern hemisphere conjugate areas. At Halley Bay, as well as at Siple, the wave appeared to be monochromatic. Data from a station array conjugate to Siple in the northern hemisphere showed the wave to be localized near L of about 3.4. Whistler wave determinations of the equatorial electron densities show the wave to occur inside the plasmasphere. The wave period and localization region are not readily reconcilable with a cold, pure hydrogen plasma. The density of heavy ions that would be required within the plasmasphere to explain the observations appears excessive from present understanding of magnetosphere plasmas.

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