Longitudinal variations of plasmapause radius and the propagation of VLF noise within small /Delta L approximately 0.5/ extensions of the plasmasphere

Details Longitudinal variations of plasmapause radius and the propagation of VLF noise within small /Delta L approximately 0.5/ extensions of the plasmasphere Longitudinal variations of plasmapause radius and the propagation of VLF noise within small /Delta L approximately 0.5/ extensions of the plasmasphere

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..980s&link_type=abstract

Geophysical Research Letters, vol. 8, Sept. 1981, p. 980-983. Research supported by the Science Research Council, Natural Enviro

Physics

15

Longitude, Plasmapause, Plasmasphere, Whistlers, Daytime, International Magnetospheric Study, Magnetospheric Electron Density, Radii, Very Low Frequencies

Scientific paper

Evidence of a variation in plasmapause radius and of a center of intense VLF noise activity within the plasmapause extension is reported based on whistler observations at two Antarctic stations. Simultaneous broadband whistler recordings were made during 1977 at Halley (75.5 deg S, 26.9 deg W) and Siple Station (75.9 deg S, 84.3 deg W). During two periods characterized by well-defined whistlers, the equatorial electron densities deduced from the whistlers indicated an approximately 0.5 L greater distance to the plasma trough at the longitude of Halley than at Siple. Intense VLF noise at a frequency of about 2.5 kHz was also observed at Halley but not at Siple, and its propagation path was identified with that of a whistler component travelling close to the plasmapause within the region of larger radius. The noise is interpreted as due to a gyroresonance instability generated when energetic electrons drifting eastwards in the plasma trough encountered enhanced plasma density in the extension of the plasmasphere.

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