Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere
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...
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ftleicester:oai:lra.le.ac.uk:2381/28758 2023-05-15T14:03:40+02:00 Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere Smith, A. J. Carpenter, D. L. Lester, Mark 2014-04-14T11:14:44Z http://onlinelibrary.wiley.com/doi/10.1029/GL008i009p00980/abstract http://hdl.handle.net/2381/28758 https://doi.org/10.1029/GL008i009p00980 en eng American Geophysical Union http://hdl.handle.net/2381/22095 2381/22095 Geophysical Research Letters, 1981, 8 (9), pp. 980-983 0094-8276 http://onlinelibrary.wiley.com/doi/10.1029/GL008i009p00980/abstract http://hdl.handle.net/2381/28758 doi:10.1029/GL008i009p00980 1944-8007 © 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. Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Journal Article Article;Journal 2014 ftleicester https://doi.org/10.1029/GL008i009p00980 2019-03-22T20:19:17Z 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. Peer-reviewed Publisher Version 70969 Article in Journal/Newspaper Antarc* Antarctic University of Leicester: Leicester Research Archive (LRA) Antarctic Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Geophysical Research Letters 8 9 980 983 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology |
spellingShingle |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Smith, A. J. Carpenter, D. L. Lester, Mark Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
topic_facet |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology |
description |
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. Peer-reviewed Publisher Version 70969 |
format |
Article in Journal/Newspaper |
author |
Smith, A. J. Carpenter, D. L. Lester, Mark |
author_facet |
Smith, A. J. Carpenter, D. L. Lester, Mark |
author_sort |
Smith, A. J. |
title |
Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
title_short |
Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
title_full |
Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
title_fullStr |
Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
title_full_unstemmed |
Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
title_sort |
longitudinal variations of plasmapause radius and the propagation of vlf noise within small (δl ∼ 0.5) extensions of the plasmasphere |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
http://onlinelibrary.wiley.com/doi/10.1029/GL008i009p00980/abstract http://hdl.handle.net/2381/28758 https://doi.org/10.1029/GL008i009p00980 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
geographic |
Antarctic Siple |
geographic_facet |
Antarctic Siple |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://hdl.handle.net/2381/22095 2381/22095 Geophysical Research Letters, 1981, 8 (9), pp. 980-983 0094-8276 http://onlinelibrary.wiley.com/doi/10.1029/GL008i009p00980/abstract http://hdl.handle.net/2381/28758 doi:10.1029/GL008i009p00980 1944-8007 |
op_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. |
op_doi |
https://doi.org/10.1029/GL008i009p00980 |
container_title |
Geophysical Research Letters |
container_volume |
8 |
container_issue |
9 |
container_start_page |
980 |
op_container_end_page |
983 |
_version_ |
1766274448914120704 |