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 |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
1996
|
Subjects: | |
Online Access: | https://doi.org/10.1007/s00585-996-0619-0 https://doaj.org/article/05bde9b34b6e4227bab0340aab2a481a |
id |
ftdoajarticles:oai:doaj.org/article:05bde9b34b6e4227bab0340aab2a481a |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:05bde9b34b6e4227bab0340aab2a481a 2023-05-15T13:58:43+02:00 Ducted whistler-mode signals received at two widely spaced locations M. A. Clilverd N. R. Thomson A. J. Smith 1996-06-01T00:00:00Z https://doi.org/10.1007/s00585-996-0619-0 https://doaj.org/article/05bde9b34b6e4227bab0340aab2a481a EN eng Copernicus Publications https://www.ann-geophys.net/14/619/1996/angeo-14-619-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-0619-0 0992-7689 1432-0576 https://doaj.org/article/05bde9b34b6e4227bab0340aab2a481a Annales Geophysicae, Vol 14, Pp 619-627 (1996) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1996 ftdoajarticles https://doi.org/10.1007/s00585-996-0619-0 2022-12-31T06:45:58Z 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 K p \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 Directory of Open Access Journals: DOAJ Articles Faraday ENVELOPE(-64.256,-64.256,-65.246,-65.246) New Zealand Annales Geophysicae 14 6 619 627 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 M. A. Clilverd N. R. Thomson A. J. Smith Ducted whistler-mode signals received at two widely spaced locations |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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 K p \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 |
M. A. Clilverd N. R. Thomson A. J. Smith |
author_facet |
M. A. Clilverd N. R. Thomson A. J. Smith |
author_sort |
M. A. Clilverd |
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 |
Copernicus Publications |
publishDate |
1996 |
url |
https://doi.org/10.1007/s00585-996-0619-0 https://doaj.org/article/05bde9b34b6e4227bab0340aab2a481a |
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_source |
Annales Geophysicae, Vol 14, Pp 619-627 (1996) |
op_relation |
https://www.ann-geophys.net/14/619/1996/angeo-14-619-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-0619-0 0992-7689 1432-0576 https://doaj.org/article/05bde9b34b6e4227bab0340aab2a481a |
op_doi |
https://doi.org/10.1007/s00585-996-0619-0 |
container_title |
Annales Geophysicae |
container_volume |
14 |
container_issue |
6 |
container_start_page |
619 |
op_container_end_page |
627 |
_version_ |
1766267065068421120 |