A comparison of EISCAT and HF Doppler observations of a ULF wave
International audience 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 st...
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ftccsdartic:oai:HAL:hal-00316447v1 2023-11-12T04:16:35+01:00 A comparison of EISCAT and HF Doppler observations of a ULF wave Wright, D. M. Yeoman, T. K. Davies, J. A. Department of Physics and Astronomy Leicester University of Leicester 1998 https://hal.science/hal-00316447 https://hal.science/hal-00316447/document https://hal.science/hal-00316447/file/angeo-16-1190-1998.pdf en eng HAL CCSD European Geosciences Union hal-00316447 https://hal.science/hal-00316447 https://hal.science/hal-00316447/document https://hal.science/hal-00316447/file/angeo-16-1190-1998.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316447 Annales Geophysicae, 1998, 16 (10), pp.1190-1199 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1998 ftccsdartic 2023-10-21T23:08:27Z International audience 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. Article in Journal/Newspaper EISCAT Northern Norway Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway Ramfjordmoen ENVELOPE(19.207,19.207,69.584,69.584) Seljelvnes ENVELOPE(19.411,19.411,69.282,69.282) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Wright, D. M. Yeoman, T. K. Davies, J. A. A comparison of EISCAT and HF Doppler observations of a ULF wave |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Department of Physics and Astronomy Leicester University of Leicester |
format |
Article in Journal/Newspaper |
author |
Wright, D. M. Yeoman, T. K. Davies, J. A. |
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 |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.science/hal-00316447 https://hal.science/hal-00316447/document https://hal.science/hal-00316447/file/angeo-16-1190-1998.pdf |
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 |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316447 Annales Geophysicae, 1998, 16 (10), pp.1190-1199 |
op_relation |
hal-00316447 https://hal.science/hal-00316447 https://hal.science/hal-00316447/document https://hal.science/hal-00316447/file/angeo-16-1190-1998.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333643283234816 |