Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp
On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Green-land between 13:00 and 14:00 UT. During that interval, a sudden reorganisation of the...
Published in: | Annales Geophysicae |
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ftdoajarticles:oai:doaj.org/article:76c67a475a7048c6b158af003ccdd0a4 2023-05-15T16:04:39+02:00 Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp H. J. Opgenoorth M. Lockwood D. Alcaydé E. Donovan M. J. Engebretson A. P. van Eyken K. Kauristie M. Lester J. Moen J. Waterman H. Alleyne M. André M. W. Dunlop N. Cornilleau-Wehrlin A. Masson A. Fazerkerley H. Rème R. André O. Amm A. Balogh R. Behlke P. L. Blelly H. Boholm E. Borälv J. M. Bosqued S. Buchert M. Candidi J. C. Cerisier C. Cully W. F. Denig P. Eglitis R. A. Greenwald B. Jackal J. D. Kelly I. Krauklis G. Lu I. R. Mann M. F. Marcucci I. W. McCrea M. Maksimovic S. Massetti P. M. E. Décréau D. K. Milling S. Orsini F. Pitout G. Provan J. M. Ruohoniemi 2001-09-01T00:00:00Z https://doi.org/10.5194/angeo-19-1367-2001 https://doaj.org/article/76c67a475a7048c6b158af003ccdd0a4 EN eng Copernicus Publications https://www.ann-geophys.net/19/1367/2001/angeo-19-1367-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-1367-2001 0992-7689 1432-0576 https://doaj.org/article/76c67a475a7048c6b158af003ccdd0a4 Annales Geophysicae, Vol 19, Pp 1367-1398 (2001) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2001 ftdoajarticles https://doi.org/10.5194/angeo-19-1367-2001 2022-12-30T21:58:54Z On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Green-land between 13:00 and 14:00 UT. During that interval, a sudden reorganisation of the high-latitude dayside convection pattern occurred after 13:20 UT, most likely caused by a direction change of the Solar wind magnetic field. The result was an eastward and poleward directed flow-channel, as monitored by the SuperDARN radar network and also by arrays of ground-based magnetometers in Canada, Greenland and Scandinavia. After an initial eastward and later poleward expansion of the flow-channel between 13:20 and 13:40 UT, the four Cluster spacecraft, and the field line footprints covered by the eastward looking scan cycle of the Söndre Strömfjord incoherent scatter radar were engulfed by cusp-like precipitation with transient magnetic and electric field signatures. In addition, the EISCAT Svalbard Radar detected strong transient effects of the convection reorganisation, a poleward moving precipitation, and a fast ion flow-channel in association with the auroral structures that suddenly formed to the west and north of the radar. From a detailed analysis of the coordinated Cluster and ground-based data, it was found that this extraordinary transient convection pattern, indeed, had moved the cusp precipitation from its former pre-noon position into the late post-noon sector, allowing for the first and quite unexpected encounter of the cusp by the Cluster spacecraft. Our findings illustrate the large amplitude of cusp dynamics even in response to moderate solar wind forcing. The global ground-based data proves to be an invaluable tool to monitor the dynamics and width of the affected magnetospheric regions. Key words. Magnetospheric cusp, ionosphere, reconnection, convection flow-channel, Cluster, ground-based observations Article in Journal/Newspaper EISCAT Greenland Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Canada Greenland Annales Geophysicae 19 10/12 1367 1398 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 H. J. Opgenoorth M. Lockwood D. Alcaydé E. Donovan M. J. Engebretson A. P. van Eyken K. Kauristie M. Lester J. Moen J. Waterman H. Alleyne M. André M. W. Dunlop N. Cornilleau-Wehrlin A. Masson A. Fazerkerley H. Rème R. André O. Amm A. Balogh R. Behlke P. L. Blelly H. Boholm E. Borälv J. M. Bosqued S. Buchert M. Candidi J. C. Cerisier C. Cully W. F. Denig P. Eglitis R. A. Greenwald B. Jackal J. D. Kelly I. Krauklis G. Lu I. R. Mann M. F. Marcucci I. W. McCrea M. Maksimovic S. Massetti P. M. E. Décréau D. K. Milling S. Orsini F. Pitout G. Provan J. M. Ruohoniemi Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Green-land between 13:00 and 14:00 UT. During that interval, a sudden reorganisation of the high-latitude dayside convection pattern occurred after 13:20 UT, most likely caused by a direction change of the Solar wind magnetic field. The result was an eastward and poleward directed flow-channel, as monitored by the SuperDARN radar network and also by arrays of ground-based magnetometers in Canada, Greenland and Scandinavia. After an initial eastward and later poleward expansion of the flow-channel between 13:20 and 13:40 UT, the four Cluster spacecraft, and the field line footprints covered by the eastward looking scan cycle of the Söndre Strömfjord incoherent scatter radar were engulfed by cusp-like precipitation with transient magnetic and electric field signatures. In addition, the EISCAT Svalbard Radar detected strong transient effects of the convection reorganisation, a poleward moving precipitation, and a fast ion flow-channel in association with the auroral structures that suddenly formed to the west and north of the radar. From a detailed analysis of the coordinated Cluster and ground-based data, it was found that this extraordinary transient convection pattern, indeed, had moved the cusp precipitation from its former pre-noon position into the late post-noon sector, allowing for the first and quite unexpected encounter of the cusp by the Cluster spacecraft. Our findings illustrate the large amplitude of cusp dynamics even in response to moderate solar wind forcing. The global ground-based data proves to be an invaluable tool to monitor the dynamics and width of the affected magnetospheric regions. Key words. Magnetospheric cusp, ionosphere, reconnection, convection flow-channel, Cluster, ground-based observations |
format |
Article in Journal/Newspaper |
author |
H. J. Opgenoorth M. Lockwood D. Alcaydé E. Donovan M. J. Engebretson A. P. van Eyken K. Kauristie M. Lester J. Moen J. Waterman H. Alleyne M. André M. W. Dunlop N. Cornilleau-Wehrlin A. Masson A. Fazerkerley H. Rème R. André O. Amm A. Balogh R. Behlke P. L. Blelly H. Boholm E. Borälv J. M. Bosqued S. Buchert M. Candidi J. C. Cerisier C. Cully W. F. Denig P. Eglitis R. A. Greenwald B. Jackal J. D. Kelly I. Krauklis G. Lu I. R. Mann M. F. Marcucci I. W. McCrea M. Maksimovic S. Massetti P. M. E. Décréau D. K. Milling S. Orsini F. Pitout G. Provan J. M. Ruohoniemi |
author_facet |
H. J. Opgenoorth M. Lockwood D. Alcaydé E. Donovan M. J. Engebretson A. P. van Eyken K. Kauristie M. Lester J. Moen J. Waterman H. Alleyne M. André M. W. Dunlop N. Cornilleau-Wehrlin A. Masson A. Fazerkerley H. Rème R. André O. Amm A. Balogh R. Behlke P. L. Blelly H. Boholm E. Borälv J. M. Bosqued S. Buchert M. Candidi J. C. Cerisier C. Cully W. F. Denig P. Eglitis R. A. Greenwald B. Jackal J. D. Kelly I. Krauklis G. Lu I. R. Mann M. F. Marcucci I. W. McCrea M. Maksimovic S. Massetti P. M. E. Décréau D. K. Milling S. Orsini F. Pitout G. Provan J. M. Ruohoniemi |
author_sort |
H. J. Opgenoorth |
title |
Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
title_short |
Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
title_full |
Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
title_fullStr |
Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
title_full_unstemmed |
Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
title_sort |
coordinated ground-based, low altitude satellite and cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
publisher |
Copernicus Publications |
publishDate |
2001 |
url |
https://doi.org/10.5194/angeo-19-1367-2001 https://doaj.org/article/76c67a475a7048c6b158af003ccdd0a4 |
geographic |
Svalbard Canada Greenland |
geographic_facet |
Svalbard Canada Greenland |
genre |
EISCAT Greenland Svalbard |
genre_facet |
EISCAT Greenland Svalbard |
op_source |
Annales Geophysicae, Vol 19, Pp 1367-1398 (2001) |
op_relation |
https://www.ann-geophys.net/19/1367/2001/angeo-19-1367-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-1367-2001 0992-7689 1432-0576 https://doaj.org/article/76c67a475a7048c6b158af003ccdd0a4 |
op_doi |
https://doi.org/10.5194/angeo-19-1367-2001 |
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Annales Geophysicae |
container_volume |
19 |
container_issue |
10/12 |
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1367 |
op_container_end_page |
1398 |
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