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Magnetotail topology around substorm onset time
Meurant, M.; Donovan, E. F.; Gérard, Jean-Claude et al.
2006AGU Fall Meeting
Editorial reviewed
 

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Keywords :
2730 Magnetosphere: inner; 2740 Magnetospheric configuration and dynamics; 2744 Magnetotail; 2790 Substorms
Abstract :
[en] The time evolution of the magnetotail topology during minutes preceding and following substorm onset is an important question of the magnetospheric dynamic. The substorm onset is a local and explosive phenomenon, which makes it difficult to describe with in situ data. In this study, we investigate this problem thanks the remote sensing data provided by the FUV camera onboard the IMAGE spacecraft. In the first part of this study, we use a set of IMAGE-FUV and GOES-8 simultaneous observations obtained during substorms periods to develop a model of the magnetic field elevation angle at geosynchronous orbit. In the second part, we use a set of 259 substorms observed by the IMAGE spacecraft between 2000 and 2002. Taking advantage of the global scale of the observations provided by IMAGE-FUV, we describe the time evolution of the magnetotail topology provided by the model. An interesting result shows that the field is symmetrically stretched around the onset position before the onset time and this symmetry is broken after onset, with a more important stretching duskward to the onset.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Meurant, M.;  University of Calgary - U of C. > Institute for Space Research
Donovan, E. F.;  University of Calgary - U of C. > Institute for Space Research
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Blockx, Caroline ;  Université de Liège - ULiège > Aquapôle
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Coumans, Valérie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Spanswick, E.;  University of Calgary - U of C. > Institute for Space Research
Connors, M.;  Athabasca University, 1 University Drive, Athabasca, AB T9S 3A3 Canada
Language :
English
Title :
Magnetotail topology around substorm onset time
Publication date :
01 December 2006
Event name :
AGU Fall Meeting
Event organizer :
AGU
Event date :
December
Audience :
International
Peer reviewed :
Editorial reviewed
Available on ORBi :
since 23 December 2009

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