Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity
We present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas r...
Published in: | Journal of Geophysical Research: Space Physics |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/504975/ https://nora.nerc.ac.uk/id/eprint/504975/1/jgra50566.pdf https://doi.org/10.1002/jgra.50566 |
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ftnerc:oai:nora.nerc.ac.uk:504975 2023-05-15T18:43:13+02:00 Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity Milan, S. E. Grocott, A. de Larquier, S. Lester, M. Yeoman, T. K. Freeman, M. P. Chisham, G. 2013-10-01 text http://nora.nerc.ac.uk/id/eprint/504975/ https://nora.nerc.ac.uk/id/eprint/504975/1/jgra50566.pdf https://doi.org/10.1002/jgra.50566 en eng Wiley https://nora.nerc.ac.uk/id/eprint/504975/1/jgra50566.pdf Milan, S. E.; Grocott, A.; de Larquier, S.; Lester, M.; Yeoman, T. K.; Freeman, M. P. orcid:0000-0002-8653-8279 Chisham, G. orcid:0000-0003-1151-5934 . 2013 Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity. Journal of Geophysical Research: Space Physics, 118 (10). 6608-6617. https://doi.org/10.1002/jgra.50566 <https://doi.org/10.1002/jgra.50566> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/jgra.50566 2023-02-04T19:38:42Z We present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas region. This anomaly is thought to be produced by uplift of the ionosphere by prevailing equatorward thermospheric winds. Of particular interest are perturbations of the WSA-supported propagation, which suggest that during periods of geomagnetic disturbance, the ionospheric layer can be lowered by several tens of kilometers and subsequently recover over a period of 1 to 2 h. Perturbations can appear singly or as a train of two to three events. We discuss possible causes of the perturbations and conclude that they are associated with equatorward propagating large-scale atmospheric waves produced by magnetospheric energy deposition in the auroral or subauroral ionosphere. Changes in high/middle latitude electrodynamics during geomagnetic storms may also account for the perturbations, but further modeling is required to fully understand their cause. Article in Journal/Newspaper Weddell Sea Natural Environment Research Council: NERC Open Research Archive Weddell Sea Austral Pacific Weddell Journal of Geophysical Research: Space Physics 118 10 6608 6617 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
We present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas region. This anomaly is thought to be produced by uplift of the ionosphere by prevailing equatorward thermospheric winds. Of particular interest are perturbations of the WSA-supported propagation, which suggest that during periods of geomagnetic disturbance, the ionospheric layer can be lowered by several tens of kilometers and subsequently recover over a period of 1 to 2 h. Perturbations can appear singly or as a train of two to three events. We discuss possible causes of the perturbations and conclude that they are associated with equatorward propagating large-scale atmospheric waves produced by magnetospheric energy deposition in the auroral or subauroral ionosphere. Changes in high/middle latitude electrodynamics during geomagnetic storms may also account for the perturbations, but further modeling is required to fully understand their cause. |
format |
Article in Journal/Newspaper |
author |
Milan, S. E. Grocott, A. de Larquier, S. Lester, M. Yeoman, T. K. Freeman, M. P. Chisham, G. |
spellingShingle |
Milan, S. E. Grocott, A. de Larquier, S. Lester, M. Yeoman, T. K. Freeman, M. P. Chisham, G. Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
author_facet |
Milan, S. E. Grocott, A. de Larquier, S. Lester, M. Yeoman, T. K. Freeman, M. P. Chisham, G. |
author_sort |
Milan, S. E. |
title |
Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
title_short |
Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
title_full |
Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
title_fullStr |
Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
title_full_unstemmed |
Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
title_sort |
traveling ionospheric disturbances in the weddell sea anomaly associated with geomagnetic activity |
publisher |
Wiley |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/504975/ https://nora.nerc.ac.uk/id/eprint/504975/1/jgra50566.pdf https://doi.org/10.1002/jgra.50566 |
geographic |
Weddell Sea Austral Pacific Weddell |
geographic_facet |
Weddell Sea Austral Pacific Weddell |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/504975/1/jgra50566.pdf Milan, S. E.; Grocott, A.; de Larquier, S.; Lester, M.; Yeoman, T. K.; Freeman, M. P. orcid:0000-0002-8653-8279 Chisham, G. orcid:0000-0003-1151-5934 . 2013 Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity. Journal of Geophysical Research: Space Physics, 118 (10). 6608-6617. https://doi.org/10.1002/jgra.50566 <https://doi.org/10.1002/jgra.50566> |
op_doi |
https://doi.org/10.1002/jgra.50566 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
118 |
container_issue |
10 |
container_start_page |
6608 |
op_container_end_page |
6617 |
_version_ |
1766233196552257536 |