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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ftcopernicus:oai:publications.copernicus.org:angeo34217 2023-05-15T16:04:31+02:00 A comparison of EISCAT and HF Doppler observations of a ULF wave Wright, D. M. Yeoman, T. K. Davies, J. A. 2018-09-27 application/pdf https://doi.org/10.1007/s00585-998-1190-7 https://angeo.copernicus.org/articles/16/1190/1998/ eng eng doi:10.1007/s00585-998-1190-7 https://angeo.copernicus.org/articles/16/1190/1998/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.1007/s00585-998-1190-7 2020-07-20T16:28:05Z 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 Text EISCAT Northern Norway Copernicus Publications: E-Journals 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 |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
author |
Wright, D. M. Yeoman, T. K. Davies, J. A. |
spellingShingle |
Wright, D. M. Yeoman, T. K. Davies, J. A. A comparison of EISCAT and HF Doppler observations of a ULF wave |
author_facet |
Wright, D. M. Yeoman, T. K. Davies, J. A. |
author_sort |
Wright, D. M. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.1007/s00585-998-1190-7 https://angeo.copernicus.org/articles/16/1190/1998/ |
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 |
eISSN: 1432-0576 |
op_relation |
doi:10.1007/s00585-998-1190-7 https://angeo.copernicus.org/articles/16/1190/1998/ |
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 |
_version_ |
1766400098321825792 |