Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters
We report the results of the first multisite campaign using VLF Doppler receivers to detect whistler mode signals in the south Atlantic originating from VLF transmitters in the northern hemisphere. The signals at 24 and 21.4 kHz were recorded by a mobile receiver on board the RRS Bransfield during F...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
1996
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Online Access: | http://nora.nerc.ac.uk/id/eprint/514953/ https://doi.org/10.1029/95JA03153 |
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ftnerc:oai:nora.nerc.ac.uk:514953 2023-05-15T13:49:33+02:00 Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters Clilverd, Mark A. Horne, Richard B. 1996-02 http://nora.nerc.ac.uk/id/eprint/514953/ https://doi.org/10.1029/95JA03153 unknown American Geophysical Union Clilverd, Mark A. orcid:0000-0002-7388-1529 Horne, Richard B. orcid:0000-0002-0412-6407 . 1996 Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters. Journal of Geophysical Research: Space Physics, 101 (A2). 2355-2367. https://doi.org/10.1029/95JA03153 <https://doi.org/10.1029/95JA03153> Publication - Article PeerReviewed 1996 ftnerc https://doi.org/10.1029/95JA03153 2023-02-04T19:43:48Z We report the results of the first multisite campaign using VLF Doppler receivers to detect whistler mode signals in the south Atlantic originating from VLF transmitters in the northern hemisphere. The signals at 24 and 21.4 kHz were recorded by a mobile receiver on board the RRS Bransfield during February–March 1993 and an identical system at Faraday, Antarctica. The data show that the output power of plasmaspheric ducts varies with latitude, decreasing with increasing L shell between 1.6 ≤ L ≤ 2.7. Using the HOTRAY ray tracing code, we find that the primary cause of the latitudinal variation in duct output power is absorption via cyclotron resonance with energetic electrons in the plasmasphere. The variation is due mainly to the reduction in resonant energy with increasing L shell which brings more particles into resonance with the wave. We demonstrate that ground-based observations of the absorption of whistler mode signals originating from VLF transmitters can be used as a new way of estimating the energetic electron flux between 1 and 40 keV inside the plasmasphere between 1.6 ≤ L ≤ 2.7. Typically, estimates of electron flux of 1 to 7 times greater than that reported by Schield and Frank [1970] are required to model the experimental data recorded here during nondisturbed geomagnetic conditions. Article in Journal/Newspaper Antarc* Antarctica Natural Environment Research Council: NERC Open Research Archive Faraday ENVELOPE(-64.256,-64.256,-65.246,-65.246) Journal of Geophysical Research: Space Physics 101 A2 2355 2367 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
We report the results of the first multisite campaign using VLF Doppler receivers to detect whistler mode signals in the south Atlantic originating from VLF transmitters in the northern hemisphere. The signals at 24 and 21.4 kHz were recorded by a mobile receiver on board the RRS Bransfield during February–March 1993 and an identical system at Faraday, Antarctica. The data show that the output power of plasmaspheric ducts varies with latitude, decreasing with increasing L shell between 1.6 ≤ L ≤ 2.7. Using the HOTRAY ray tracing code, we find that the primary cause of the latitudinal variation in duct output power is absorption via cyclotron resonance with energetic electrons in the plasmasphere. The variation is due mainly to the reduction in resonant energy with increasing L shell which brings more particles into resonance with the wave. We demonstrate that ground-based observations of the absorption of whistler mode signals originating from VLF transmitters can be used as a new way of estimating the energetic electron flux between 1 and 40 keV inside the plasmasphere between 1.6 ≤ L ≤ 2.7. Typically, estimates of electron flux of 1 to 7 times greater than that reported by Schield and Frank [1970] are required to model the experimental data recorded here during nondisturbed geomagnetic conditions. |
format |
Article in Journal/Newspaper |
author |
Clilverd, Mark A. Horne, Richard B. |
spellingShingle |
Clilverd, Mark A. Horne, Richard B. Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters |
author_facet |
Clilverd, Mark A. Horne, Richard B. |
author_sort |
Clilverd, Mark A. |
title |
Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters |
title_short |
Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters |
title_full |
Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters |
title_fullStr |
Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters |
title_full_unstemmed |
Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters |
title_sort |
ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from vlf transmitters |
publisher |
American Geophysical Union |
publishDate |
1996 |
url |
http://nora.nerc.ac.uk/id/eprint/514953/ https://doi.org/10.1029/95JA03153 |
long_lat |
ENVELOPE(-64.256,-64.256,-65.246,-65.246) |
geographic |
Faraday |
geographic_facet |
Faraday |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Clilverd, Mark A. orcid:0000-0002-7388-1529 Horne, Richard B. orcid:0000-0002-0412-6407 . 1996 Ground-based evidence of latitude-dependent cyclotron absorption of whistler mode signals originating from VLF transmitters. Journal of Geophysical Research: Space Physics, 101 (A2). 2355-2367. https://doi.org/10.1029/95JA03153 <https://doi.org/10.1029/95JA03153> |
op_doi |
https://doi.org/10.1029/95JA03153 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
101 |
container_issue |
A2 |
container_start_page |
2355 |
op_container_end_page |
2367 |
_version_ |
1766251578494287872 |