Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph
This study investigates the evolution of 10 January 1997 magnetic storm and the nighttime space weather change created by the impact of the interplanetary shock wave and associated events on the ionosphere. Its aims are to trace the storm's energy flow dissipation and transportation processes a...
Published in: | Journal of Geophysical Research: Space Physics |
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Language: | English |
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American Geophysical Union
2007
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Online Access: | https://espace.library.uq.edu.au/view/UQ:129315/UQ129315_OA.pdf https://espace.library.uq.edu.au/view/UQ:129315 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:129315 2023-05-15T18:43:18+02:00 Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph Horvath, Ildiko 2007-06-30 https://espace.library.uq.edu.au/view/UQ:129315/UQ129315_OA.pdf https://espace.library.uq.edu.au/view/UQ:129315 eng eng American Geophysical Union doi:10.1029/2006JA012153 issn:0148-0227 issn:2156-2202 orcid:0000-0002-1899-3907 Astronomy & Astrophysics F-region Ionospheric Storms Magnetic-field F2-layer Disturbances Latitudes Event Wind 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services 0401 Atmospheric Sciences Journal Article 2007 ftunivqespace https://doi.org/10.1029/2006JA012153 2020-12-28T23:33:45Z This study investigates the evolution of 10 January 1997 magnetic storm and the nighttime space weather change created by the impact of the interplanetary shock wave and associated events on the ionosphere. Its aims are to trace the storm's energy flow dissipation and transportation processes and to learn about the response of nighttime ionosphere to these interplanetary events, focusing on the reaction of the nighttime Weddell Sea Anomaly (WSA). To track down the consequential space weather changes, multi-instrument measurements and Coupled Thermosphere/Ionosphere Plasmasphere (CTIP) simulations were combined. As results show, the first response of nighttime WSA to the energy input in the magnetosphere, when B turned southward, was its ∼50% total electron content (TEC) and Ni increase maintained during the main phase, indicating long-duration positive storm effects. At ∼0800 universal time (UT) the second such B event triggered the depletion of equatorial and northern midlatitude ionosphere, a signature of strong downward ExB plasma drift, and launched gravity waves. Following a period of very bright aurora, at ∼ 1200 UT, some southern midlatitude and subauroral plasma enhancements developed. TOPEX detected an enhancement between 45-65°S (dip), where the equatorward winds were most effective, with a sudden TEC drop-off, a signature of the plasmapause. Particularly strong negative storm effects depleted the nighttime WSA's TEC-Ni (∼45-50%) and O/N ratio (∼21%). The Bent model could simulate the WSA, but not the storm-related ionospheric responses. CTIP simulations indicated equatorward winds causing downwellings and changes in the neutral atmospheric composition revealed by the O/N ratio. Joule heating and electric fields were the major geophysical factors observed changing space weather during this storm. Copyright 2007 by the American Geophysical Union. Article in Journal/Newspaper Weddell Sea The University of Queensland: UQ eSpace Weddell Sea Weddell Journal of Geophysical Research: Space Physics 112 A6 n/a n/a |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Astronomy & Astrophysics F-region Ionospheric Storms Magnetic-field F2-layer Disturbances Latitudes Event Wind 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services 0401 Atmospheric Sciences |
spellingShingle |
Astronomy & Astrophysics F-region Ionospheric Storms Magnetic-field F2-layer Disturbances Latitudes Event Wind 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services 0401 Atmospheric Sciences Horvath, Ildiko Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph |
topic_facet |
Astronomy & Astrophysics F-region Ionospheric Storms Magnetic-field F2-layer Disturbances Latitudes Event Wind 260603 Ionospheric and Magnetospheric Physics 280301 Programming Techniques C1 610100 - Defence 700300 Communication Services 0401 Atmospheric Sciences |
description |
This study investigates the evolution of 10 January 1997 magnetic storm and the nighttime space weather change created by the impact of the interplanetary shock wave and associated events on the ionosphere. Its aims are to trace the storm's energy flow dissipation and transportation processes and to learn about the response of nighttime ionosphere to these interplanetary events, focusing on the reaction of the nighttime Weddell Sea Anomaly (WSA). To track down the consequential space weather changes, multi-instrument measurements and Coupled Thermosphere/Ionosphere Plasmasphere (CTIP) simulations were combined. As results show, the first response of nighttime WSA to the energy input in the magnetosphere, when B turned southward, was its ∼50% total electron content (TEC) and Ni increase maintained during the main phase, indicating long-duration positive storm effects. At ∼0800 universal time (UT) the second such B event triggered the depletion of equatorial and northern midlatitude ionosphere, a signature of strong downward ExB plasma drift, and launched gravity waves. Following a period of very bright aurora, at ∼ 1200 UT, some southern midlatitude and subauroral plasma enhancements developed. TOPEX detected an enhancement between 45-65°S (dip), where the equatorward winds were most effective, with a sudden TEC drop-off, a signature of the plasmapause. Particularly strong negative storm effects depleted the nighttime WSA's TEC-Ni (∼45-50%) and O/N ratio (∼21%). The Bent model could simulate the WSA, but not the storm-related ionospheric responses. CTIP simulations indicated equatorward winds causing downwellings and changes in the neutral atmospheric composition revealed by the O/N ratio. Joule heating and electric fields were the major geophysical factors observed changing space weather during this storm. Copyright 2007 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Horvath, Ildiko |
author_facet |
Horvath, Ildiko |
author_sort |
Horvath, Ildiko |
title |
Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph |
title_short |
Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph |
title_full |
Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph |
title_fullStr |
Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph |
title_full_unstemmed |
Impact of 10 January 1997 geomagnetic storm on the nighttime Weddell Sea Anomaly: A study utilizing data provided by the TOPEX/Poseidon mission and the Defense Meteorological Satellite Program, and simulations generated by the Coupled Thermosphere/Ionosph |
title_sort |
impact of 10 january 1997 geomagnetic storm on the nighttime weddell sea anomaly: a study utilizing data provided by the topex/poseidon mission and the defense meteorological satellite program, and simulations generated by the coupled thermosphere/ionosph |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
https://espace.library.uq.edu.au/view/UQ:129315/UQ129315_OA.pdf https://espace.library.uq.edu.au/view/UQ:129315 |
geographic |
Weddell Sea Weddell |
geographic_facet |
Weddell Sea Weddell |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
doi:10.1029/2006JA012153 issn:0148-0227 issn:2156-2202 orcid:0000-0002-1899-3907 |
op_doi |
https://doi.org/10.1029/2006JA012153 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
112 |
container_issue |
A6 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766233619014090752 |