A comparison of EISCAT and HF Doppler observations of a ULF wave
Since the middle of 1995, an HF Doppler sounder has been running almost continuously in northern Norway, with the receiver at Ramfjordmoen and the transmitter at Seljelvnes. Concurrent operation of the EISCAT UHF radar in common programme (CP-1) mode has made it possible to study the ionospheric sig...
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Copernicus Publications
1998
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ftdoajarticles:oai:doaj.org/article:efb7a89381244ffb9a35ccc9c03ba675 2023-05-15T16:04:32+02:00 A comparison of EISCAT and HF Doppler observations of a ULF wave D. M. Wright T. K. Yeoman J. A. Davies 1998-10-01T00:00:00Z https://doi.org/10.1007/s00585-998-1190-7 https://doaj.org/article/efb7a89381244ffb9a35ccc9c03ba675 EN eng Copernicus Publications https://www.ann-geophys.net/16/1190/1998/angeo-16-1190-1998.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-998-1190-7 0992-7689 1432-0576 https://doaj.org/article/efb7a89381244ffb9a35ccc9c03ba675 Annales Geophysicae, Vol 16, Pp 1190-1199 (1998) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1998 ftdoajarticles https://doi.org/10.1007/s00585-998-1190-7 2022-12-31T03:49:10Z Since the middle of 1995, an HF Doppler sounder has been running almost continuously in northern Norway, with the receiver at Ramfjordmoen and the transmitter at Seljelvnes. Concurrent operation of the EISCAT UHF radar in common programme (CP-1) mode has made it possible to study the ionospheric signature of a magnetospheric ULF wave. These are the first results of such wave signatures observed simultaneously in both instruments. It has been demonstrated that the observed Doppler signature was mainly due to the vertical bulk motion of the ionosphere caused by the electric field perturbation of the ULF wave and the first direct observational confirmation of a numerical simulation has been achieved. The wave, which was Alfvénic in nature, was detected by the instruments 8° equatorward of the broad resonance region. The implications for the deduced wave modes in the ionosphere and the mechanism producing the HF Doppler variations are discussed. Key words. Magnetosphere-ionosphere interactions · MHD waves and instabilities · Radio science · Ionospheric physics Article in Journal/Newspaper EISCAT Northern Norway Directory of Open Access Journals: DOAJ Articles Norway Ramfjordmoen ENVELOPE(19.207,19.207,69.584,69.584) Seljelvnes ENVELOPE(19.411,19.411,69.282,69.282) Annales Geophysicae 16 10 1190 1199 |
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 D. M. Wright T. K. Yeoman J. A. Davies A comparison of EISCAT and HF Doppler observations of a ULF wave |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Since the middle of 1995, an HF Doppler sounder has been running almost continuously in northern Norway, with the receiver at Ramfjordmoen and the transmitter at Seljelvnes. Concurrent operation of the EISCAT UHF radar in common programme (CP-1) mode has made it possible to study the ionospheric signature of a magnetospheric ULF wave. These are the first results of such wave signatures observed simultaneously in both instruments. It has been demonstrated that the observed Doppler signature was mainly due to the vertical bulk motion of the ionosphere caused by the electric field perturbation of the ULF wave and the first direct observational confirmation of a numerical simulation has been achieved. The wave, which was Alfvénic in nature, was detected by the instruments 8° equatorward of the broad resonance region. The implications for the deduced wave modes in the ionosphere and the mechanism producing the HF Doppler variations are discussed. Key words. Magnetosphere-ionosphere interactions · MHD waves and instabilities · Radio science · Ionospheric physics |
format |
Article in Journal/Newspaper |
author |
D. M. Wright T. K. Yeoman J. A. Davies |
author_facet |
D. M. Wright T. K. Yeoman J. A. Davies |
author_sort |
D. M. Wright |
title |
A comparison of EISCAT and HF Doppler observations of a ULF wave |
title_short |
A comparison of EISCAT and HF Doppler observations of a ULF wave |
title_full |
A comparison of EISCAT and HF Doppler observations of a ULF wave |
title_fullStr |
A comparison of EISCAT and HF Doppler observations of a ULF wave |
title_full_unstemmed |
A comparison of EISCAT and HF Doppler observations of a ULF wave |
title_sort |
comparison of eiscat and hf doppler observations of a ulf wave |
publisher |
Copernicus Publications |
publishDate |
1998 |
url |
https://doi.org/10.1007/s00585-998-1190-7 https://doaj.org/article/efb7a89381244ffb9a35ccc9c03ba675 |
long_lat |
ENVELOPE(19.207,19.207,69.584,69.584) ENVELOPE(19.411,19.411,69.282,69.282) |
geographic |
Norway Ramfjordmoen Seljelvnes |
geographic_facet |
Norway Ramfjordmoen Seljelvnes |
genre |
EISCAT Northern Norway |
genre_facet |
EISCAT Northern Norway |
op_source |
Annales Geophysicae, Vol 16, Pp 1190-1199 (1998) |
op_relation |
https://www.ann-geophys.net/16/1190/1998/angeo-16-1190-1998.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-998-1190-7 0992-7689 1432-0576 https://doaj.org/article/efb7a89381244ffb9a35ccc9c03ba675 |
op_doi |
https://doi.org/10.1007/s00585-998-1190-7 |
container_title |
Annales Geophysicae |
container_volume |
16 |
container_issue |
10 |
container_start_page |
1190 |
op_container_end_page |
1199 |
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1766400113499963392 |