High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes
International audience The DOPE (Doppler Pulsation Experiment) HF Doppler sounder located near Tromsø, Norway (geographic: 69.6°N 19.2°E; L = 6.3) is deployed to observe signatures, in the high-latitude ionosphere, of magnetospheric ULF waves. A type of wave has been identified which exhibits no sim...
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ftccsdartic:oai:HAL:hal-00316624v1 2023-11-12T04:27:30+01:00 High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes Wright, D. M. Yeoman, T. K. Department of Physics and Astronomy Leicester University of Leicester 1999 https://hal.science/hal-00316624 https://hal.science/hal-00316624/document https://hal.science/hal-00316624/file/angeo-17-868-1999.pdf en eng HAL CCSD European Geosciences Union hal-00316624 https://hal.science/hal-00316624 https://hal.science/hal-00316624/document https://hal.science/hal-00316624/file/angeo-17-868-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316624 Annales Geophysicae, 1999, 17 (7), pp.868-876 [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 1999 ftccsdartic 2023-10-21T23:08:17Z International audience The DOPE (Doppler Pulsation Experiment) HF Doppler sounder located near Tromsø, Norway (geographic: 69.6°N 19.2°E; L = 6.3) is deployed to observe signatures, in the high-latitude ionosphere, of magnetospheric ULF waves. A type of wave has been identified which exhibits no simultaneous ground magnetic signature. They can be subdivided into two classes which occur in the dawn and dusk local time sectors respectively. They generally have frequencies greater than the resonance fundamentals of local field lines. It is suggested that these may be the signatures of high- m ULF waves where the ground magnetic signature has been strongly attenuated as a result of the scale size of the waves. The dawn population demonstrate similarities to a type of magnetospheric wave known as giant (Pg) pulsations which tend to be resonant at higher harmonics on magnetic field lines. In contrast, the waves occurring in the dusk sector are believed to be related to the storm-time Pc5s previously reported in VHF radar data. Dst measurements support these observations by indicating that the dawn and dusk classes of waves occur respectively during geomagnetically quiet and more active intervals. Article in Journal/Newspaper Tromsø Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway Tromsø |
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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. High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The DOPE (Doppler Pulsation Experiment) HF Doppler sounder located near Tromsø, Norway (geographic: 69.6°N 19.2°E; L = 6.3) is deployed to observe signatures, in the high-latitude ionosphere, of magnetospheric ULF waves. A type of wave has been identified which exhibits no simultaneous ground magnetic signature. They can be subdivided into two classes which occur in the dawn and dusk local time sectors respectively. They generally have frequencies greater than the resonance fundamentals of local field lines. It is suggested that these may be the signatures of high- m ULF waves where the ground magnetic signature has been strongly attenuated as a result of the scale size of the waves. The dawn population demonstrate similarities to a type of magnetospheric wave known as giant (Pg) pulsations which tend to be resonant at higher harmonics on magnetic field lines. In contrast, the waves occurring in the dusk sector are believed to be related to the storm-time Pc5s previously reported in VHF radar data. Dst measurements support these observations by indicating that the dawn and dusk classes of waves occur respectively during geomagnetically quiet and more active intervals. |
author2 |
Department of Physics and Astronomy Leicester University of Leicester |
format |
Article in Journal/Newspaper |
author |
Wright, D. M. Yeoman, T. K. |
author_facet |
Wright, D. M. Yeoman, T. K. |
author_sort |
Wright, D. M. |
title |
High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
title_short |
High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
title_full |
High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
title_fullStr |
High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
title_full_unstemmed |
High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
title_sort |
high-latitude hf doppler observations of ulf waves: 2. waves with small spatial scale sizes |
publisher |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.science/hal-00316624 https://hal.science/hal-00316624/document https://hal.science/hal-00316624/file/angeo-17-868-1999.pdf |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316624 Annales Geophysicae, 1999, 17 (7), pp.868-876 |
op_relation |
hal-00316624 https://hal.science/hal-00316624 https://hal.science/hal-00316624/document https://hal.science/hal-00316624/file/angeo-17-868-1999.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782341085033398272 |