On the importance of interplanetary magnetic field B on polar cap patch formation
[1] A number of poleward moving events were observed between 1130 and 1300 UT on 11 February 2004, during periods of southward interplanetary magnetic field (IMF), while the steerable antenna of the European Incoherent Scatter (EISCAT) Svalbard radar (ESR) and the Tromsø VHF radar pointed nearly nor...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union (AGU); Wiley
2012
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Online Access: | http://hdl.handle.net/2381/20522 http://onlinelibrary.wiley.com/doi/10.1029/2010JA016287/abstract https://doi.org/10.1029/2010JA016287 |
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ftleicester:oai:lra.le.ac.uk:2381/20522 2023-05-15T16:04:45+02:00 On the importance of interplanetary magnetic field B on polar cap patch formation Zhang, Q-H. Zhang, B-C. Liu, R-Y. Yang, H-G. Hu, H-Q. Hu, Z-J. Liu, S-L. Dunlop, M. W. Lockwood, M. McCrea, I. W. Moen, J. Lester, M. 2012-10-24T09:08:48Z http://hdl.handle.net/2381/20522 http://onlinelibrary.wiley.com/doi/10.1029/2010JA016287/abstract https://doi.org/10.1029/2010JA016287 unknown American Geophysical Union (AGU); Wiley Journal of Geophysical Research A: SPACE PHYSICS, 2011, 116 (5) 0148-0227 http://hdl.handle.net/2381/20522 http://onlinelibrary.wiley.com/doi/10.1029/2010JA016287/abstract doi:10.1029/2010JA016287 Copyright © 2011 by the American Geophysical Union. All rights reserved. Archived with reference to Usage Permissions granted to authors, available at http://publications.agu.org/author-resource-center/usage-permissions/ Scopus http://www.scopus.com/home.url Journal Article 2012 ftleicester https://doi.org/10.1029/2010JA016287 2019-03-22T20:17:13Z [1] A number of poleward moving events were observed between 1130 and 1300 UT on 11 February 2004, during periods of southward interplanetary magnetic field (IMF), while the steerable antenna of the European Incoherent Scatter (EISCAT) Svalbard radar (ESR) and the Tromsø VHF radar pointed nearly northward at low elevation. In this interval, simultaneous SuperDARN CUTLASS Finland radar measurements showed poleward moving radar aurora forms (PMRAFs) which appeared very similar to the density enhancements observed by the ESR northward pointing antenna. These events appeared quasiperiodically with a period of about 10 min. Comparing the observations from the above three radars, it is inferred that there is an almost one-to-one correspondence between the poleward moving plasma concentration enhancements (PMPCEs) observed by the ESR and the VHF radar and the PMRAFs measured by the CUTLASS Finland radar. These observations are consistent with the interpretation that the polar cap patch material was generated by photoionization at subauroral latitudes and that the plasma was structured by bursts of magnetopause reconnection giving access to the polar cap. There is clear evidence that plasma structuring into patches was dependent on the variability in IMF ∣By∣. The duration of these events implies that the average evolution time of the newly opened flux tubes from the subauroral region to the polar cap was about 33 min. Peer-reviewed Publisher Version 48241 Article in Journal/Newspaper EISCAT Svalbard Tromsø University of Leicester: Leicester Research Archive (LRA) Svalbard Tromsø Journal of Geophysical Research: Space Physics 116 A5 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
unknown |
description |
[1] A number of poleward moving events were observed between 1130 and 1300 UT on 11 February 2004, during periods of southward interplanetary magnetic field (IMF), while the steerable antenna of the European Incoherent Scatter (EISCAT) Svalbard radar (ESR) and the Tromsø VHF radar pointed nearly northward at low elevation. In this interval, simultaneous SuperDARN CUTLASS Finland radar measurements showed poleward moving radar aurora forms (PMRAFs) which appeared very similar to the density enhancements observed by the ESR northward pointing antenna. These events appeared quasiperiodically with a period of about 10 min. Comparing the observations from the above three radars, it is inferred that there is an almost one-to-one correspondence between the poleward moving plasma concentration enhancements (PMPCEs) observed by the ESR and the VHF radar and the PMRAFs measured by the CUTLASS Finland radar. These observations are consistent with the interpretation that the polar cap patch material was generated by photoionization at subauroral latitudes and that the plasma was structured by bursts of magnetopause reconnection giving access to the polar cap. There is clear evidence that plasma structuring into patches was dependent on the variability in IMF ∣By∣. The duration of these events implies that the average evolution time of the newly opened flux tubes from the subauroral region to the polar cap was about 33 min. Peer-reviewed Publisher Version 48241 |
format |
Article in Journal/Newspaper |
author |
Zhang, Q-H. Zhang, B-C. Liu, R-Y. Yang, H-G. Hu, H-Q. Hu, Z-J. Liu, S-L. Dunlop, M. W. Lockwood, M. McCrea, I. W. Moen, J. Lester, M. |
spellingShingle |
Zhang, Q-H. Zhang, B-C. Liu, R-Y. Yang, H-G. Hu, H-Q. Hu, Z-J. Liu, S-L. Dunlop, M. W. Lockwood, M. McCrea, I. W. Moen, J. Lester, M. On the importance of interplanetary magnetic field B on polar cap patch formation |
author_facet |
Zhang, Q-H. Zhang, B-C. Liu, R-Y. Yang, H-G. Hu, H-Q. Hu, Z-J. Liu, S-L. Dunlop, M. W. Lockwood, M. McCrea, I. W. Moen, J. Lester, M. |
author_sort |
Zhang, Q-H. |
title |
On the importance of interplanetary magnetic field B on polar cap patch formation |
title_short |
On the importance of interplanetary magnetic field B on polar cap patch formation |
title_full |
On the importance of interplanetary magnetic field B on polar cap patch formation |
title_fullStr |
On the importance of interplanetary magnetic field B on polar cap patch formation |
title_full_unstemmed |
On the importance of interplanetary magnetic field B on polar cap patch formation |
title_sort |
on the importance of interplanetary magnetic field b on polar cap patch formation |
publisher |
American Geophysical Union (AGU); Wiley |
publishDate |
2012 |
url |
http://hdl.handle.net/2381/20522 http://onlinelibrary.wiley.com/doi/10.1029/2010JA016287/abstract https://doi.org/10.1029/2010JA016287 |
geographic |
Svalbard Tromsø |
geographic_facet |
Svalbard Tromsø |
genre |
EISCAT Svalbard Tromsø |
genre_facet |
EISCAT Svalbard Tromsø |
op_source |
Scopus http://www.scopus.com/home.url |
op_relation |
Journal of Geophysical Research A: SPACE PHYSICS, 2011, 116 (5) 0148-0227 http://hdl.handle.net/2381/20522 http://onlinelibrary.wiley.com/doi/10.1029/2010JA016287/abstract doi:10.1029/2010JA016287 |
op_rights |
Copyright © 2011 by the American Geophysical Union. All rights reserved. Archived with reference to Usage Permissions granted to authors, available at http://publications.agu.org/author-resource-center/usage-permissions/ |
op_doi |
https://doi.org/10.1029/2010JA016287 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
116 |
container_issue |
A5 |
_version_ |
1766400386596339712 |