Reconfiguration of polar-cap plasma in the magnetic midnight sector
Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the feature to later times suggests that it was reconfigured in the Harang discontinuity to form an enhanc...
Published in: | Annales Geophysicae |
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Online Access: | https://doi.org/10.5194/angeo-24-2201-2006 https://angeo.copernicus.org/articles/24/2201/2006/ |
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ftcopernicus:oai:publications.copernicus.org:angeo35973 2023-05-15T16:04:39+02:00 Reconfiguration of polar-cap plasma in the magnetic midnight sector Pryse, S. E. Wood, A. G. Middleton, H. R. McCrea, I. W. Lester, M. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-24-2201-2006 https://angeo.copernicus.org/articles/24/2201/2006/ eng eng doi:10.5194/angeo-24-2201-2006 https://angeo.copernicus.org/articles/24/2201/2006/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-24-2201-2006 2020-07-20T16:27:12Z Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the feature to later times suggests that it was reconfigured in the Harang discontinuity to form an enhancement that was elongated in longitude in the sunward return flow of the high-latitude convection pattern. Comparison with a tomographic image at a later time supports the interpretation of a polar patch being reconfigured into a boundary blob. There is also evidence for a second plasma enhancement equatorward of the reconfigured blob, likely to have been produced by in situ precipitation. The observations indicate that the two mechanisms proposed in the literature for the production of boundary blobs are operating simultaneously to form two distinct density features separated slightly in latitude. Text EISCAT Copernicus Publications: E-Journals Annales Geophysicae 24 8 2201 2208 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the feature to later times suggests that it was reconfigured in the Harang discontinuity to form an enhancement that was elongated in longitude in the sunward return flow of the high-latitude convection pattern. Comparison with a tomographic image at a later time supports the interpretation of a polar patch being reconfigured into a boundary blob. There is also evidence for a second plasma enhancement equatorward of the reconfigured blob, likely to have been produced by in situ precipitation. The observations indicate that the two mechanisms proposed in the literature for the production of boundary blobs are operating simultaneously to form two distinct density features separated slightly in latitude. |
format |
Text |
author |
Pryse, S. E. Wood, A. G. Middleton, H. R. McCrea, I. W. Lester, M. |
spellingShingle |
Pryse, S. E. Wood, A. G. Middleton, H. R. McCrea, I. W. Lester, M. Reconfiguration of polar-cap plasma in the magnetic midnight sector |
author_facet |
Pryse, S. E. Wood, A. G. Middleton, H. R. McCrea, I. W. Lester, M. |
author_sort |
Pryse, S. E. |
title |
Reconfiguration of polar-cap plasma in the magnetic midnight sector |
title_short |
Reconfiguration of polar-cap plasma in the magnetic midnight sector |
title_full |
Reconfiguration of polar-cap plasma in the magnetic midnight sector |
title_fullStr |
Reconfiguration of polar-cap plasma in the magnetic midnight sector |
title_full_unstemmed |
Reconfiguration of polar-cap plasma in the magnetic midnight sector |
title_sort |
reconfiguration of polar-cap plasma in the magnetic midnight sector |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-24-2201-2006 https://angeo.copernicus.org/articles/24/2201/2006/ |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-24-2201-2006 https://angeo.copernicus.org/articles/24/2201/2006/ |
op_doi |
https://doi.org/10.5194/angeo-24-2201-2006 |
container_title |
Annales Geophysicae |
container_volume |
24 |
container_issue |
8 |
container_start_page |
2201 |
op_container_end_page |
2208 |
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1766400263967473664 |