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 re...
Published in: | Journal of Geophysical Research: Space Physics |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2014
|
Subjects: | |
Online Access: | http://onlinelibrary.wiley.com/doi/10.1002/jgra.50566/abstract http://hdl.handle.net/2381/28729 https://doi.org/10.1002/jgra.50566 |
id |
ftleicester:oai:lra.le.ac.uk:2381/28729 |
---|---|
record_format |
openpolar |
spelling |
ftleicester:oai:lra.le.ac.uk:2381/28729 2023-05-15T18:43:16+02:00 Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity Milan, Steve, E. Grocott, Adrian de Larquier, S. Lester, Mark Yeoman, Tim, K. Freeman, M. P. Chisham, G. 2014-04-08T09:09:17Z http://onlinelibrary.wiley.com/doi/10.1002/jgra.50566/abstract http://hdl.handle.net/2381/28729 https://doi.org/10.1002/jgra.50566 en eng American Geophysical Union Journal of Geophysical Research: Space Physics, 2013, 118 (10), pp. 6608-6617 2169-9380 http://onlinelibrary.wiley.com/doi/10.1002/jgra.50566/abstract http://hdl.handle.net/2381/28729 doi:10.1002/jgra.50566 2169-9402 © 2013. American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. Science & Technology Physical Sciences Astronomy & Astrophysics GEOSCIENCES MULTIDISCIPLINARY ionosphere anomaly waves SuperDARN ATMOSPHERIC GRAVITY-WAVES HF RADARS Journal Article Article;Journal 2014 ftleicester https://doi.org/10.1002/jgra.50566 2019-03-22T20:19:17Z 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. Natural Environment Research Council (NERC)NE/G019665/1 Peer-reviewed Publisher Version Article in Journal/Newspaper Weddell Sea University of Leicester: Leicester Research Archive (LRA) Weddell Sea Austral Weddell Journal of Geophysical Research: Space Physics 118 10 6608 6617 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Astronomy & Astrophysics GEOSCIENCES MULTIDISCIPLINARY ionosphere anomaly waves SuperDARN ATMOSPHERIC GRAVITY-WAVES HF RADARS |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics GEOSCIENCES MULTIDISCIPLINARY ionosphere anomaly waves SuperDARN ATMOSPHERIC GRAVITY-WAVES HF RADARS Milan, Steve, E. Grocott, Adrian de Larquier, S. Lester, Mark Yeoman, Tim, K. Freeman, M. P. Chisham, G. Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics GEOSCIENCES MULTIDISCIPLINARY ionosphere anomaly waves SuperDARN ATMOSPHERIC GRAVITY-WAVES HF RADARS |
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. Natural Environment Research Council (NERC)NE/G019665/1 Peer-reviewed Publisher Version |
format |
Article in Journal/Newspaper |
author |
Milan, Steve, E. Grocott, Adrian de Larquier, S. Lester, Mark Yeoman, Tim, K. Freeman, M. P. Chisham, G. |
author_facet |
Milan, Steve, E. Grocott, Adrian de Larquier, S. Lester, Mark Yeoman, Tim, K. Freeman, M. P. Chisham, G. |
author_sort |
Milan, Steve, 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 |
American Geophysical Union |
publishDate |
2014 |
url |
http://onlinelibrary.wiley.com/doi/10.1002/jgra.50566/abstract http://hdl.handle.net/2381/28729 https://doi.org/10.1002/jgra.50566 |
geographic |
Weddell Sea Austral Weddell |
geographic_facet |
Weddell Sea Austral Weddell |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
Journal of Geophysical Research: Space Physics, 2013, 118 (10), pp. 6608-6617 2169-9380 http://onlinelibrary.wiley.com/doi/10.1002/jgra.50566/abstract http://hdl.handle.net/2381/28729 doi:10.1002/jgra.50566 2169-9402 |
op_rights |
© 2013. American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. |
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_ |
1766233546384474112 |