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Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere

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journal contribution
posted on 14.04.2014, 11:14 by A. J. Smith, D. L. Carpenter, Mark Lester
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.

History

Citation

Geophysical Research Letters, 1981, 8 (9), pp. 980-983

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Geophysical Research Letters

Publisher

American Geophysical Union

issn

0094-8276

eissn

1944-8007

Copyright date

1981

Available date

14/04/2014

Publisher version

http://onlinelibrary.wiley.com/doi/10.1029/GL008i009p00980/abstract

Language

en