High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes
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 magnet...
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ftdoajarticles:oai:doaj.org/article:60c2f384f33646b1b5dfd219746bb83b 2023-05-15T18:34:40+02:00 High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes D. M. Wright T. K. Yeoman 1999-07-01T00:00:00Z https://doi.org/10.1007/s00585-999-0868-9 https://doaj.org/article/60c2f384f33646b1b5dfd219746bb83b EN eng Copernicus Publications https://www.ann-geophys.net/17/868/1999/angeo-17-868-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0868-9 0992-7689 1432-0576 https://doaj.org/article/60c2f384f33646b1b5dfd219746bb83b Annales Geophysicae, Vol 17, Pp 868-876 (1999) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1999 ftdoajarticles https://doi.org/10.1007/s00585-999-0868-9 2022-12-31T01:36:57Z 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. Key words. Ionosphere (auroral ionosphere; ionosphere-magnetosphere interactions) · Magnetospheric physics (MHD waves and instabilities) Article in Journal/Newspaper Tromsø Directory of Open Access Journals: DOAJ Articles Norway Tromsø Annales Geophysicae 17 7 868 876 |
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 High-latitude HF Doppler observations of ULF waves: 2. Waves with small spatial scale sizes |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
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. Key words. Ionosphere (auroral ionosphere; ionosphere-magnetosphere interactions) · Magnetospheric physics (MHD waves and instabilities) |
format |
Article in Journal/Newspaper |
author |
D. M. Wright T. K. Yeoman |
author_facet |
D. M. Wright T. K. Yeoman |
author_sort |
D. M. Wright |
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 |
Copernicus Publications |
publishDate |
1999 |
url |
https://doi.org/10.1007/s00585-999-0868-9 https://doaj.org/article/60c2f384f33646b1b5dfd219746bb83b |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
Annales Geophysicae, Vol 17, Pp 868-876 (1999) |
op_relation |
https://www.ann-geophys.net/17/868/1999/angeo-17-868-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0868-9 0992-7689 1432-0576 https://doaj.org/article/60c2f384f33646b1b5dfd219746bb83b |
op_doi |
https://doi.org/10.1007/s00585-999-0868-9 |
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Annales Geophysicae |
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17 |
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7 |
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868 |
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876 |
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1766219527879655424 |