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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ftleicesterunfig:oai:figshare.com:article/10166285 2023-05-15T14:03:49+02:00 Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere A. J. Smith D. L. Carpenter Mark Lester 1981-01-01T00:00:00Z https://figshare.com/articles/journal_contribution/Longitudinal_variations_of_plasmapause_radius_and_the_propagation_of_VLF_noise_within_small_L_0_5_extensions_of_the_plasmasphere/10166285 unknown 2381/28758 https://figshare.com/articles/journal_contribution/Longitudinal_variations_of_plasmapause_radius_and_the_propagation_of_VLF_noise_within_small_L_0_5_extensions_of_the_plasmasphere/10166285 All Rights Reserved Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Text Journal contribution 1981 ftleicesterunfig 2021-11-11T20:01:07Z 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. Other Non-Article Part of Journal/Newspaper Antarc* Antarctic University of Leicester: Figshare Antarctic Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology |
spellingShingle |
Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology A. J. Smith D. L. Carpenter Mark Lester Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere |
topic_facet |
Uncategorized 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. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
A. J. Smith D. L. Carpenter Mark Lester |
author_facet |
A. J. Smith D. L. Carpenter Mark Lester |
author_sort |
A. J. Smith |
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 |
publishDate |
1981 |
url |
https://figshare.com/articles/journal_contribution/Longitudinal_variations_of_plasmapause_radius_and_the_propagation_of_VLF_noise_within_small_L_0_5_extensions_of_the_plasmasphere/10166285 |
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 |
2381/28758 https://figshare.com/articles/journal_contribution/Longitudinal_variations_of_plasmapause_radius_and_the_propagation_of_VLF_noise_within_small_L_0_5_extensions_of_the_plasmasphere/10166285 |
op_rights |
All Rights Reserved |
_version_ |
1766274681083527168 |