ULF wave occurrence statistics in a high-latitude HF Doppler sounder
Ultra low frequency (ULF) wave activity in the high-latitude ionosphere has been observed by a high frequency (HF) Doppler sounder located at Tromsø, Norway (69.7°N, 19.2°E geographic coordinates). A statistical study of the occurrence of these waves has been undertaken from data collected between 1...
Published in: | Annales Geophysicae |
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ftcopernicus:oai:publications.copernicus.org:angeo34394 2023-05-15T18:34:33+02:00 ULF wave occurrence statistics in a high-latitude HF Doppler sounder Wright, D. M. Yeoman, T. K. Jones, T. B. 2018-09-27 application/pdf https://doi.org/10.1007/s00585-999-0749-2 https://angeo.copernicus.org/articles/17/749/1999/ eng eng doi:10.1007/s00585-999-0749-2 https://angeo.copernicus.org/articles/17/749/1999/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.1007/s00585-999-0749-2 2020-07-20T16:28:03Z Ultra low frequency (ULF) wave activity in the high-latitude ionosphere has been observed by a high frequency (HF) Doppler sounder located at Tromsø, Norway (69.7°N, 19.2°E geographic coordinates). A statistical study of the occurrence of these waves has been undertaken from data collected between 1979 and 1984. The diurnal, seasonal, solar cycle and geomagnetic activity variations in occurrence have been investigated. The findings demonstrate that the ability of the sounder to detect ULF wave signatures maximises at the equinoxes and that there is a peak in occurrence in the morning sector. The occurrence rate is fairly insensitive to changes associated with the solar cycle but increases with the level of geomagnetic activity. As a result, it has been possible to characterise the way in which prevailing ionospheric and magnetospheric conditions affect such observations of ULF waves. Key words . Ionosphere (auroral ionosphere; ionosphere -magnetosphere interactions) · Magnetospheric physics (MHD waves and instabilities) Text Tromsø Copernicus Publications: E-Journals Norway Tromsø Annales Geophysicae 17 6 749 758 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Ultra low frequency (ULF) wave activity in the high-latitude ionosphere has been observed by a high frequency (HF) Doppler sounder located at Tromsø, Norway (69.7°N, 19.2°E geographic coordinates). A statistical study of the occurrence of these waves has been undertaken from data collected between 1979 and 1984. The diurnal, seasonal, solar cycle and geomagnetic activity variations in occurrence have been investigated. The findings demonstrate that the ability of the sounder to detect ULF wave signatures maximises at the equinoxes and that there is a peak in occurrence in the morning sector. The occurrence rate is fairly insensitive to changes associated with the solar cycle but increases with the level of geomagnetic activity. As a result, it has been possible to characterise the way in which prevailing ionospheric and magnetospheric conditions affect such observations of ULF waves. Key words . Ionosphere (auroral ionosphere; ionosphere -magnetosphere interactions) · Magnetospheric physics (MHD waves and instabilities) |
format |
Text |
author |
Wright, D. M. Yeoman, T. K. Jones, T. B. |
spellingShingle |
Wright, D. M. Yeoman, T. K. Jones, T. B. ULF wave occurrence statistics in a high-latitude HF Doppler sounder |
author_facet |
Wright, D. M. Yeoman, T. K. Jones, T. B. |
author_sort |
Wright, D. M. |
title |
ULF wave occurrence statistics in a high-latitude HF Doppler sounder |
title_short |
ULF wave occurrence statistics in a high-latitude HF Doppler sounder |
title_full |
ULF wave occurrence statistics in a high-latitude HF Doppler sounder |
title_fullStr |
ULF wave occurrence statistics in a high-latitude HF Doppler sounder |
title_full_unstemmed |
ULF wave occurrence statistics in a high-latitude HF Doppler sounder |
title_sort |
ulf wave occurrence statistics in a high-latitude hf doppler sounder |
publishDate |
2018 |
url |
https://doi.org/10.1007/s00585-999-0749-2 https://angeo.copernicus.org/articles/17/749/1999/ |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.1007/s00585-999-0749-2 https://angeo.copernicus.org/articles/17/749/1999/ |
op_doi |
https://doi.org/10.1007/s00585-999-0749-2 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
6 |
container_start_page |
749 |
op_container_end_page |
758 |
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1766219340495978496 |