A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry
This paper reports on a total electron content space weather study of the nighttime Weddell Sea Anomaly, overlooked by previously published TOPEX/Poseidon climate studies, and of the nighttime ionosphere during the 1996/1997 southern summer. To ascertain the morphology of spatial TEC distribution ov...
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American Geophysical Union
2006
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:82743 2023-05-15T18:43:16+02:00 A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry Horvath, Ildiko J. Mutter P. Taylor R. Arculus 2006-12-01 https://espace.library.uq.edu.au/view/UQ:82743/UQ82743_OA.pdf https://espace.library.uq.edu.au/view/UQ:82743 eng eng American Geophysical Union doi:10.1029/2006JA011679 issn:0148-0227 issn:2156-2202 orcid:0000-0002-1899-3907 Earth-Surface Processes Ecology Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Palaeontology Forestry Aquatic Science Atmospheric Science Soil Science Geochemistry and Petrology Geophysics Oceanography Water Science and Technology 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services Journal Article 2006 ftunivqespace https://doi.org/10.1029/2006JA011679 2020-12-28T23:30:34Z This paper reports on a total electron content space weather study of the nighttime Weddell Sea Anomaly, overlooked by previously published TOPEX/Poseidon climate studies, and of the nighttime ionosphere during the 1996/1997 southern summer. To ascertain the morphology of spatial TEC distribution over the oceans in terms of hourly, geomagnetic, longitudinal and summer-winter variations, the TOPEX TEC, magnetic, and published neutral wind velocity data are utilized. To understand the underlying physical processes, the TEC results are combined with inclination and declination data plus global magnetic field-line maps. To investigate spatial and temporal TEC variations, geographic/magnetic latitudes and local times are computed. As results show, the nighttime Weddell Sea Anomaly is a large (∼1,600(°)2; ∼22 million km2 estimated for a steady ionosphere) space weather feature. Extending between 200°E and 300°E (geographic), it is an ionization enhancement peaking at 50°S–60°S/250°E–270°E and continuing beyond 66°S. It develops where the spacing between the magnetic field lines is wide/medium, easterly declination is large-medium (20°–50°), and inclination is optimum (∼55°S). Its development and hourly variations are closely correlated with wind speed variations. There is a noticeable (∼43%) reduction in its average area during the high magnetic activity period investigated. Southern summer nighttime TECs follow closely the variations of declination and field-line configuration and therefore introduce a longitudinal division of four (Indian, western/eastern Pacific, Atlantic). Northern winter nighttime TECs measured over a limited area are rather uniform longitudinally because of the small declination variation. TOPEX maps depict the expected strong asymmetry in TEC distribution about the magnetic dip equator. Article in Journal/Newspaper Weddell Sea The University of Queensland: UQ eSpace Indian Pacific Weddell Weddell Sea Journal of Geophysical Research 111 A12 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Earth-Surface Processes Ecology Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Palaeontology Forestry Aquatic Science Atmospheric Science Soil Science Geochemistry and Petrology Geophysics Oceanography Water Science and Technology 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services |
spellingShingle |
Earth-Surface Processes Ecology Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Palaeontology Forestry Aquatic Science Atmospheric Science Soil Science Geochemistry and Petrology Geophysics Oceanography Water Science and Technology 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services Horvath, Ildiko A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry |
topic_facet |
Earth-Surface Processes Ecology Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Palaeontology Forestry Aquatic Science Atmospheric Science Soil Science Geochemistry and Petrology Geophysics Oceanography Water Science and Technology 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services |
description |
This paper reports on a total electron content space weather study of the nighttime Weddell Sea Anomaly, overlooked by previously published TOPEX/Poseidon climate studies, and of the nighttime ionosphere during the 1996/1997 southern summer. To ascertain the morphology of spatial TEC distribution over the oceans in terms of hourly, geomagnetic, longitudinal and summer-winter variations, the TOPEX TEC, magnetic, and published neutral wind velocity data are utilized. To understand the underlying physical processes, the TEC results are combined with inclination and declination data plus global magnetic field-line maps. To investigate spatial and temporal TEC variations, geographic/magnetic latitudes and local times are computed. As results show, the nighttime Weddell Sea Anomaly is a large (∼1,600(°)2; ∼22 million km2 estimated for a steady ionosphere) space weather feature. Extending between 200°E and 300°E (geographic), it is an ionization enhancement peaking at 50°S–60°S/250°E–270°E and continuing beyond 66°S. It develops where the spacing between the magnetic field lines is wide/medium, easterly declination is large-medium (20°–50°), and inclination is optimum (∼55°S). Its development and hourly variations are closely correlated with wind speed variations. There is a noticeable (∼43%) reduction in its average area during the high magnetic activity period investigated. Southern summer nighttime TECs follow closely the variations of declination and field-line configuration and therefore introduce a longitudinal division of four (Indian, western/eastern Pacific, Atlantic). Northern winter nighttime TECs measured over a limited area are rather uniform longitudinally because of the small declination variation. TOPEX maps depict the expected strong asymmetry in TEC distribution about the magnetic dip equator. |
author2 |
J. Mutter P. Taylor R. Arculus |
format |
Article in Journal/Newspaper |
author |
Horvath, Ildiko |
author_facet |
Horvath, Ildiko |
author_sort |
Horvath, Ildiko |
title |
A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry |
title_short |
A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry |
title_full |
A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry |
title_fullStr |
A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry |
title_full_unstemmed |
A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry |
title_sort |
total electron content space weather study of the nighttime weddell sea anomaly of 1996/97 southern summer with topex/poseidon radar altimetry |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
https://espace.library.uq.edu.au/view/UQ:82743/UQ82743_OA.pdf https://espace.library.uq.edu.au/view/UQ:82743 |
geographic |
Indian Pacific Weddell Weddell Sea |
geographic_facet |
Indian Pacific Weddell Weddell Sea |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
doi:10.1029/2006JA011679 issn:0148-0227 issn:2156-2202 orcid:0000-0002-1899-3907 |
op_doi |
https://doi.org/10.1029/2006JA011679 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
A12 |
_version_ |
1766233534723260416 |