Ducted whistler-mode signals received at two widely spaced locations
Whistler-mode signals from a single VLF transmitter that have propagated in the same duct, have been observed simultaneously at Faraday, Antarctica (65°S, 64°W) and Dunedin, New Zealand (46°S, 171°E). The signals received have group-delay times that differ in the order of 10 ms, which can be explain...
Published in: | Annales Geophysicae |
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1996
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00037773 2023-05-15T14:02:33+02:00 Ducted whistler-mode signals received at two widely spaced locations Clilverd, M. A. Thomson, N. R. Smith, A. J. 1996-06 electronic https://doi.org/10.1007/s00585-996-0619-0 https://noa.gwlb.de/receive/cop_mods_00037773 eng eng Springer Verlag Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-996-0619-0 https://noa.gwlb.de/receive/cop_mods_00037773 https://open-access.net/ uneingeschränkt info:eu-repo/semantics/restrictedAccess article Verlagsveröffentlichung article Text doc-type:article 1996 ftnonlinearchiv https://doi.org/10.1007/s00585-996-0619-0 2022-02-08T22:43:22Z Whistler-mode signals from a single VLF transmitter that have propagated in the same duct, have been observed simultaneously at Faraday, Antarctica (65°S, 64°W) and Dunedin, New Zealand (46°S, 171°E). The signals received have group-delay times that differ in the order of 10 ms, which can be explained by the differences in southern-hemisphere sub-ionospheric propagation time from duct exit region to receiver for the two sites. This difference has been used to determine the location of the duct exit region, with confirmation provided by arrival-bearing information from both sites. The whistler-mode signals typically occur one or two days after geomagnetic activity, with Kp\geq5. The sub-ionospheric-propagation model, LWPC, is used to estimate the whistler-mode power radiated from the duct exit region. These results are then combined with estimated loss values for ionospheric and ducted transmission to investigate the role of wave-particle amplification or absorption. On at least half of the events studied, plasmaspheric amplification of the signals appears to be needed to explain the observed whistler-mode signal strengths. Article in Journal/Newspaper Antarc* Antarctica Niedersächsisches Online-Archiv NOA Faraday ENVELOPE(-64.256,-64.256,-65.246,-65.246) New Zealand Annales Geophysicae 14 6 619 627 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Clilverd, M. A. Thomson, N. R. Smith, A. J. Ducted whistler-mode signals received at two widely spaced locations |
topic_facet |
article Verlagsveröffentlichung |
description |
Whistler-mode signals from a single VLF transmitter that have propagated in the same duct, have been observed simultaneously at Faraday, Antarctica (65°S, 64°W) and Dunedin, New Zealand (46°S, 171°E). The signals received have group-delay times that differ in the order of 10 ms, which can be explained by the differences in southern-hemisphere sub-ionospheric propagation time from duct exit region to receiver for the two sites. This difference has been used to determine the location of the duct exit region, with confirmation provided by arrival-bearing information from both sites. The whistler-mode signals typically occur one or two days after geomagnetic activity, with Kp\geq5. The sub-ionospheric-propagation model, LWPC, is used to estimate the whistler-mode power radiated from the duct exit region. These results are then combined with estimated loss values for ionospheric and ducted transmission to investigate the role of wave-particle amplification or absorption. On at least half of the events studied, plasmaspheric amplification of the signals appears to be needed to explain the observed whistler-mode signal strengths. |
format |
Article in Journal/Newspaper |
author |
Clilverd, M. A. Thomson, N. R. Smith, A. J. |
author_facet |
Clilverd, M. A. Thomson, N. R. Smith, A. J. |
author_sort |
Clilverd, M. A. |
title |
Ducted whistler-mode signals received at two widely spaced locations |
title_short |
Ducted whistler-mode signals received at two widely spaced locations |
title_full |
Ducted whistler-mode signals received at two widely spaced locations |
title_fullStr |
Ducted whistler-mode signals received at two widely spaced locations |
title_full_unstemmed |
Ducted whistler-mode signals received at two widely spaced locations |
title_sort |
ducted whistler-mode signals received at two widely spaced locations |
publisher |
Springer Verlag |
publishDate |
1996 |
url |
https://doi.org/10.1007/s00585-996-0619-0 https://noa.gwlb.de/receive/cop_mods_00037773 |
long_lat |
ENVELOPE(-64.256,-64.256,-65.246,-65.246) |
geographic |
Faraday New Zealand |
geographic_facet |
Faraday New Zealand |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-996-0619-0 https://noa.gwlb.de/receive/cop_mods_00037773 |
op_rights |
https://open-access.net/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00585-996-0619-0 |
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Annales Geophysicae |
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14 |
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6 |
container_start_page |
619 |
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627 |
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1766272873360523264 |