Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance
Lower-thermospheric winds at high latitudes during moderately-disturbed geomagnetic conditions were studied using data obtained with the European Incoherent Scatter (EISCAT) Kiruna-Sodankylä-Tromsø (KST) ultrahigh frequency (UHF) radar system on 9–10 September 2004. The antenna-beam configuration wa...
Published in: | Annales Geophysicae |
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Language: | English |
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Copernicus Publications
2008
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Online Access: | https://doi.org/10.5194/angeo-26-1491-2008 https://noa.gwlb.de/receive/cop_mods_00031396 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031350/angeo-26-1491-2008.pdf https://angeo.copernicus.org/articles/26/1491/2008/angeo-26-1491-2008.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00031396 2023-05-15T16:04:35+02:00 Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance Oyama, S. Watkins, B. J. Maeda, S. Shinagawa, H. Nozawa, S. Ogawa, Y. Brekke, A. Lathuillere, C. Kofman, W. 2008-06 electronic https://doi.org/10.5194/angeo-26-1491-2008 https://noa.gwlb.de/receive/cop_mods_00031396 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031350/angeo-26-1491-2008.pdf https://angeo.copernicus.org/articles/26/1491/2008/angeo-26-1491-2008.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-26-1491-2008 https://noa.gwlb.de/receive/cop_mods_00031396 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031350/angeo-26-1491-2008.pdf https://angeo.copernicus.org/articles/26/1491/2008/angeo-26-1491-2008.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2008 ftnonlinearchiv https://doi.org/10.5194/angeo-26-1491-2008 2022-02-08T22:46:46Z Lower-thermospheric winds at high latitudes during moderately-disturbed geomagnetic conditions were studied using data obtained with the European Incoherent Scatter (EISCAT) Kiruna-Sodankylä-Tromsø (KST) ultrahigh frequency (UHF) radar system on 9–10 September 2004. The antenna-beam configuration was newly designed to minimize the estimated measurement error of the vertical neutral-wind speed in the lower thermosphere. This method was also available to estimate the meridional and zonal components. The vertical neutral-wind speed at 109 km, 114 km, and 120 km heights showed large upward motions in excess of 30 m s−1 in association with an ionospheric heating event. Large downward speeds in excess of −30 m s−1 were also observed before and after the heating event. The meridional neutral-wind speed suddenly changed its direction from equatorward to poleward when the heating event began, and then returned equatorward coinciding with a decrease in the heating event. The magnetometer data from northern Scandinavia suggested that the center of the heated region was located about 80 km equatorward of Tromsø. The pressure gradient caused the lower-thermospheric wind to accelerate obliquely upward over Tromsø in the poleward direction. Acceleration of the neutral wind flowing on a vertically tilted isobar produced vertical wind speeds larger by more than two orders of magnitude than previously predicted, but still an order of magnitude smaller than observed speeds. Article in Journal/Newspaper EISCAT Kiruna Sodankylä Tromsø Niedersächsisches Online-Archiv NOA Kiruna Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Tromsø Annales Geophysicae 26 6 1491 1505 |
institution |
Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Oyama, S. Watkins, B. J. Maeda, S. Shinagawa, H. Nozawa, S. Ogawa, Y. Brekke, A. Lathuillere, C. Kofman, W. Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance |
topic_facet |
article Verlagsveröffentlichung |
description |
Lower-thermospheric winds at high latitudes during moderately-disturbed geomagnetic conditions were studied using data obtained with the European Incoherent Scatter (EISCAT) Kiruna-Sodankylä-Tromsø (KST) ultrahigh frequency (UHF) radar system on 9–10 September 2004. The antenna-beam configuration was newly designed to minimize the estimated measurement error of the vertical neutral-wind speed in the lower thermosphere. This method was also available to estimate the meridional and zonal components. The vertical neutral-wind speed at 109 km, 114 km, and 120 km heights showed large upward motions in excess of 30 m s−1 in association with an ionospheric heating event. Large downward speeds in excess of −30 m s−1 were also observed before and after the heating event. The meridional neutral-wind speed suddenly changed its direction from equatorward to poleward when the heating event began, and then returned equatorward coinciding with a decrease in the heating event. The magnetometer data from northern Scandinavia suggested that the center of the heated region was located about 80 km equatorward of Tromsø. The pressure gradient caused the lower-thermospheric wind to accelerate obliquely upward over Tromsø in the poleward direction. Acceleration of the neutral wind flowing on a vertically tilted isobar produced vertical wind speeds larger by more than two orders of magnitude than previously predicted, but still an order of magnitude smaller than observed speeds. |
format |
Article in Journal/Newspaper |
author |
Oyama, S. Watkins, B. J. Maeda, S. Shinagawa, H. Nozawa, S. Ogawa, Y. Brekke, A. Lathuillere, C. Kofman, W. |
author_facet |
Oyama, S. Watkins, B. J. Maeda, S. Shinagawa, H. Nozawa, S. Ogawa, Y. Brekke, A. Lathuillere, C. Kofman, W. |
author_sort |
Oyama, S. |
title |
Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance |
title_short |
Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance |
title_full |
Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance |
title_fullStr |
Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance |
title_full_unstemmed |
Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance |
title_sort |
generation of the lower-thermospheric vertical wind estimated with the eiscat kst radar at high latitudes during periods of moderate geomagnetic disturbance |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/angeo-26-1491-2008 https://noa.gwlb.de/receive/cop_mods_00031396 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031350/angeo-26-1491-2008.pdf https://angeo.copernicus.org/articles/26/1491/2008/angeo-26-1491-2008.pdf |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Kiruna Sodankylä Tromsø |
geographic_facet |
Kiruna Sodankylä Tromsø |
genre |
EISCAT Kiruna Sodankylä Tromsø |
genre_facet |
EISCAT Kiruna Sodankylä Tromsø |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-26-1491-2008 https://noa.gwlb.de/receive/cop_mods_00031396 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031350/angeo-26-1491-2008.pdf https://angeo.copernicus.org/articles/26/1491/2008/angeo-26-1491-2008.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-26-1491-2008 |
container_title |
Annales Geophysicae |
container_volume |
26 |
container_issue |
6 |
container_start_page |
1491 |
op_container_end_page |
1505 |
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1766400188391358464 |