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Title: Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere
Authors: Smith, A. J.
Carpenter, D. L.
Lester, Mark
First Published: 1-Jan-1981
Publisher: American Geophysical Union
Citation: Geophysical Research Letters, 1981, 8 (9), pp. 980-983
Abstract: Simultaneous broadband whistler recordings made during the International Magnetospheric Study (IMS) at the two Antarctic stations Halley and Siple have been used to study longitudinal variations in the radius of the plasmapause observed during local afternoon. In both of the two periods studied thus far, whistler-derived equatorial electron density profiles imply an increase in plasmapause radius between the longitudes of Siple and Halley (Δϕ ∼ 30°) of ΔL ∼ 0.5. Intense VLF noise (∼2.5 kHz) was observed at Halley but not at Siple, and by echo analysis its propagation path was identified with that of a whistler component travelling close to the plasmapause within the region of larger radius. This leads to the conclusion that the noise was generated by a gyroresonance instability when energetic electrons (typically 10 keV), drifting eastwards in the plasmatrough, encountered enhanced plasma density in the small extension of the plasmasphere.
DOI Link: 10.1029/GL008i009p00980
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: © 1981 American Geophysical Union. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website. An edited version of this paper was published by AGU.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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