Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer
[i] This study utilized the multi-instrument data of the Defense Meteorological Satellite Program to investigate the evening/nighttime topside ionosphere during the 1996/1997 southern summer. A series of regional surface maps were constructed and permitted the tracking of the topside ionosphere'...
Published in: | Journal of Geophysical Research: Space Physics |
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Language: | English |
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American Geophysical Union
2009
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Online Access: | https://espace.library.uq.edu.au/view/UQ:177328/UQ177328_OA.pdf https://espace.library.uq.edu.au/view/UQ:177328 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:177328 2023-05-15T18:43:17+02:00 Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer Horvath, Ildiko Lovell, Brian C. 2009-02-12 https://espace.library.uq.edu.au/view/UQ:177328/UQ177328_OA.pdf https://espace.library.uq.edu.au/view/UQ:177328 eng eng American Geophysical Union doi:10.1029/2008JA013719 issn:0148-0227 orcid:0000-0002-1899-3907 orcid:0000-0001-6722-1754 Electron temperature enhancement Interplanetary magnetic field High latitude ionoshpere Auroral red arcs Equatorial Ionosphere C1 810199 Defence not elsewhere classified 020107 Mesospheric Ionospheric and Magnetospheric Physics Journal Article 2009 ftunivqespace https://doi.org/10.1029/2008JA013719 2020-12-28T23:39:04Z [i] This study utilized the multi-instrument data of the Defense Meteorological Satellite Program to investigate the evening/nighttime topside ionosphere during the 1996/1997 southern summer. A series of regional surface maps were constructed and permitted the tracking of the topside ionosphere's plasma density features, plasma composition, thermal structures, and vertical and horizontal plasma flows. These maps tracked a complete nighttime Weddell Sea Anomaly (WSA) and strong horizontal plasma flows that registered the high-conductivity regions of the South Atlantic Magnetic Anomaly (SAMA). These regions developed over the southeastern Pacific, just equatorward of the WSA, and over the South Atlantic. A heavy-ion stagnation trough developed poleward of the SAMA affected regions. Thus, the trough appeared on the WSA's equatorward side. During periods of increasing magnetic activity, the plasmapause was the WSA's poleward boundary. A statistical study modeled the trough's magnetic activity dependence and revealed a strong east-west hemispherical difference that was due to the SAMA effects. When the AE6 was 0 nT, the trough appeared at (57.49 ± 2.82)°S (geomagnetic) over the southwestern hemisphere. Owing to the SAMA's special electrodynamic effects, the trough developed at lower latitudes, (42.39 ± 3.04)°S, over the southeastern hemisphere. Meanwhile, the plasmapause occurred at ̃(62.5 ± 4)°S, and the WSA's peak appeared at ̃(56.2 ± 4)°S. Hence, there was a ̃20° (lat) separation between the trough and the plasmapause over the southeastern hemisphere. Between 210°E and 330°E (geographic), the WSA filled this gap. With increasing magnetic activity, the trough in the SAMA affected regions moved poleward at a rate of (0.0157 ± 0.004)°S/nT. Elsewhere, it had a (0.0196 ± 0.002)°S/nT equatorward movement. Article in Journal/Newspaper Weddell Sea The University of Queensland: UQ eSpace Weddell Sea Pacific Weddell Journal of Geophysical Research: Space Physics 114 A2 n/a n/a |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Electron temperature enhancement Interplanetary magnetic field High latitude ionoshpere Auroral red arcs Equatorial Ionosphere C1 810199 Defence not elsewhere classified 020107 Mesospheric Ionospheric and Magnetospheric Physics |
spellingShingle |
Electron temperature enhancement Interplanetary magnetic field High latitude ionoshpere Auroral red arcs Equatorial Ionosphere C1 810199 Defence not elsewhere classified 020107 Mesospheric Ionospheric and Magnetospheric Physics Horvath, Ildiko Lovell, Brian C. Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer |
topic_facet |
Electron temperature enhancement Interplanetary magnetic field High latitude ionoshpere Auroral red arcs Equatorial Ionosphere C1 810199 Defence not elsewhere classified 020107 Mesospheric Ionospheric and Magnetospheric Physics |
description |
[i] This study utilized the multi-instrument data of the Defense Meteorological Satellite Program to investigate the evening/nighttime topside ionosphere during the 1996/1997 southern summer. A series of regional surface maps were constructed and permitted the tracking of the topside ionosphere's plasma density features, plasma composition, thermal structures, and vertical and horizontal plasma flows. These maps tracked a complete nighttime Weddell Sea Anomaly (WSA) and strong horizontal plasma flows that registered the high-conductivity regions of the South Atlantic Magnetic Anomaly (SAMA). These regions developed over the southeastern Pacific, just equatorward of the WSA, and over the South Atlantic. A heavy-ion stagnation trough developed poleward of the SAMA affected regions. Thus, the trough appeared on the WSA's equatorward side. During periods of increasing magnetic activity, the plasmapause was the WSA's poleward boundary. A statistical study modeled the trough's magnetic activity dependence and revealed a strong east-west hemispherical difference that was due to the SAMA effects. When the AE6 was 0 nT, the trough appeared at (57.49 ± 2.82)°S (geomagnetic) over the southwestern hemisphere. Owing to the SAMA's special electrodynamic effects, the trough developed at lower latitudes, (42.39 ± 3.04)°S, over the southeastern hemisphere. Meanwhile, the plasmapause occurred at ̃(62.5 ± 4)°S, and the WSA's peak appeared at ̃(56.2 ± 4)°S. Hence, there was a ̃20° (lat) separation between the trough and the plasmapause over the southeastern hemisphere. Between 210°E and 330°E (geographic), the WSA filled this gap. With increasing magnetic activity, the trough in the SAMA affected regions moved poleward at a rate of (0.0157 ± 0.004)°S/nT. Elsewhere, it had a (0.0196 ± 0.002)°S/nT equatorward movement. |
format |
Article in Journal/Newspaper |
author |
Horvath, Ildiko Lovell, Brian C. |
author_facet |
Horvath, Ildiko Lovell, Brian C. |
author_sort |
Horvath, Ildiko |
title |
Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer |
title_short |
Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer |
title_full |
Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer |
title_fullStr |
Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer |
title_full_unstemmed |
Investigating the relationships among the South Atlantic Magnetic Anomaly, southern nighttime midlatitude trough, and nighttime Weddell Sea Anomaly during southern summer |
title_sort |
investigating the relationships among the south atlantic magnetic anomaly, southern nighttime midlatitude trough, and nighttime weddell sea anomaly during southern summer |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
https://espace.library.uq.edu.au/view/UQ:177328/UQ177328_OA.pdf https://espace.library.uq.edu.au/view/UQ:177328 |
geographic |
Weddell Sea Pacific Weddell |
geographic_facet |
Weddell Sea Pacific Weddell |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
doi:10.1029/2008JA013719 issn:0148-0227 orcid:0000-0002-1899-3907 orcid:0000-0001-6722-1754 |
op_doi |
https://doi.org/10.1029/2008JA013719 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
114 |
container_issue |
A2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766233605704515584 |