Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions
Tracking the formation and full evolution of polar cap ionization patches in the polar ionosphere, we directly observe the full Dungey convection cycle for southward interplanetary magnetic field (IMF) conditions. This enables us to study how the Dungey cycle influences the patches’ evolution. The p...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
2015
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Online Access: | https://centaur.reading.ac.uk/41320/ https://centaur.reading.ac.uk/41320/1/323_Zhang_et_al-2015.pdf https://doi.org/10.1002/2015JA021172 |
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ftunivreading:oai:centaur.reading.ac.uk:41320 2024-06-23T07:57:13+00:00 Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions Zhang, Q.-H. Lockwood, Mike Foster, J. C. Zhang, S.-R. Zhang, B.-C. McCrea, I. W. Moen, J. Lester, M. Ruohoniemi, J. M. 2015-07-17 text https://centaur.reading.ac.uk/41320/ https://centaur.reading.ac.uk/41320/1/323_Zhang_et_al-2015.pdf https://doi.org/10.1002/2015JA021172 en eng American Geophysical Union https://centaur.reading.ac.uk/41320/1/323_Zhang_et_al-2015.pdf Zhang, Q.-H., Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 , Foster, J. C., Zhang, S.-R., Zhang, B.-C., McCrea, I. W., Moen, J., Lester, M. and Ruohoniemi, J. M. (2015) Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions. Journal of Geophysical Research: Space Physics, 120 (6). pp. 4519-4530. ISSN 2169-9402 doi: https://doi.org/10.1002/2015JA021172 <https://doi.org/10.1002/2015JA021172> cc_by_nc_nd_4 Article PeerReviewed 2015 ftunivreading https://doi.org/10.1002/2015JA021172 2024-06-11T15:04:44Z Tracking the formation and full evolution of polar cap ionization patches in the polar ionosphere, we directly observe the full Dungey convection cycle for southward interplanetary magnetic field (IMF) conditions. This enables us to study how the Dungey cycle influences the patches’ evolution. The patches were initially segmented from the dayside storm enhanced density plume at the equatorward edge of the cusp, by the expansion and contraction of the polar cap boundary due to pulsed dayside magnetopause reconnection, as indicated by in situ Time History of Events and Macroscale Interactions during Substorms(THEMIS) observations. Convection led to the patches entering the polar cap and being transported antisunward, while being continuously monitored by the globally distributed arrays of GPS receivers and Super Dual Auroral Radar Network radars. Changes in convection over time resulted in the patches following a range of trajectories, each of which differed somewhat from the classical twin-cell convection streamlines. Pulsed nightside reconnection, occurring as part of the magnetospheric substorm cycle, modulated the exit of the patches from the polar cap, as confirmed by coordinated observations of the magnetometer at Tromsø and European Incoherent Scatter Tromsø UHF radar. After exiting the polar cap, the patches broke up into a number of plasma blobs and returned sunward in the auroral return flow of the dawn and/or dusk convection cell. The full circulation time was about 3 h. Article in Journal/Newspaper Tromsø CentAUR: Central Archive at the University of Reading Tromsø Journal of Geophysical Research: Space Physics 120 6 4519 4530 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
Tracking the formation and full evolution of polar cap ionization patches in the polar ionosphere, we directly observe the full Dungey convection cycle for southward interplanetary magnetic field (IMF) conditions. This enables us to study how the Dungey cycle influences the patches’ evolution. The patches were initially segmented from the dayside storm enhanced density plume at the equatorward edge of the cusp, by the expansion and contraction of the polar cap boundary due to pulsed dayside magnetopause reconnection, as indicated by in situ Time History of Events and Macroscale Interactions during Substorms(THEMIS) observations. Convection led to the patches entering the polar cap and being transported antisunward, while being continuously monitored by the globally distributed arrays of GPS receivers and Super Dual Auroral Radar Network radars. Changes in convection over time resulted in the patches following a range of trajectories, each of which differed somewhat from the classical twin-cell convection streamlines. Pulsed nightside reconnection, occurring as part of the magnetospheric substorm cycle, modulated the exit of the patches from the polar cap, as confirmed by coordinated observations of the magnetometer at Tromsø and European Incoherent Scatter Tromsø UHF radar. After exiting the polar cap, the patches broke up into a number of plasma blobs and returned sunward in the auroral return flow of the dawn and/or dusk convection cell. The full circulation time was about 3 h. |
format |
Article in Journal/Newspaper |
author |
Zhang, Q.-H. Lockwood, Mike Foster, J. C. Zhang, S.-R. Zhang, B.-C. McCrea, I. W. Moen, J. Lester, M. Ruohoniemi, J. M. |
spellingShingle |
Zhang, Q.-H. Lockwood, Mike Foster, J. C. Zhang, S.-R. Zhang, B.-C. McCrea, I. W. Moen, J. Lester, M. Ruohoniemi, J. M. Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
author_facet |
Zhang, Q.-H. Lockwood, Mike Foster, J. C. Zhang, S.-R. Zhang, B.-C. McCrea, I. W. Moen, J. Lester, M. Ruohoniemi, J. M. |
author_sort |
Zhang, Q.-H. |
title |
Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
title_short |
Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
title_full |
Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
title_fullStr |
Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
title_full_unstemmed |
Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
title_sort |
direct observations of the full dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
https://centaur.reading.ac.uk/41320/ https://centaur.reading.ac.uk/41320/1/323_Zhang_et_al-2015.pdf https://doi.org/10.1002/2015JA021172 |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_relation |
https://centaur.reading.ac.uk/41320/1/323_Zhang_et_al-2015.pdf Zhang, Q.-H., Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 , Foster, J. C., Zhang, S.-R., Zhang, B.-C., McCrea, I. W., Moen, J., Lester, M. and Ruohoniemi, J. M. (2015) Direct observations of the full Dungey convection cycle in the polar ionosphere for southward interplanetary magnetic field conditions. Journal of Geophysical Research: Space Physics, 120 (6). pp. 4519-4530. ISSN 2169-9402 doi: https://doi.org/10.1002/2015JA021172 <https://doi.org/10.1002/2015JA021172> |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1002/2015JA021172 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
120 |
container_issue |
6 |
container_start_page |
4519 |
op_container_end_page |
4530 |
_version_ |
1802650762152509440 |