Reference : Open magnetic flux and magnetic flux closure during sawtooth events

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/29194

Title :	Open magnetic flux and magnetic flux closure during sawtooth events
Language :	English
Author, co-author :	Hubert, Benoît [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Milan, S. E. [> > > >]
	Grocott, A. [> > > >]
	Cowley, S. W. H. [> > > >]
	Gérard, Jean-Claude [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Publication date :	1-Dec-2008
Journal title :	Geophysical Research Letters
Publisher :	American Geophysical Union
Volume :	35
Pages :	23301
Audience :	International
ISSN :	0094-8276
City :	Washington
Country :	DC
Keywords :	[en] Magnetospheric Physics: Magnetic reconnection (7526 ; 7835) ; Magnetospheric Physics: Auroral phenomena (2407) ; Magnetospheric Physics: Magnetic storms and substorms (7954) ; Magnetospheric Physics: Substorms ; Magnetospheric Physics: Solar wind/magnetosphere interactions
Abstract :	[en] We use IMAGE-FUV observations of the polar aurora and measurements of the ionospheric convection from the SuperDARN radar network to study several sawtooth events previously reported in the literature. We estimate the amount of open magnetic flux in the Earth magnetosphere during a significant part of these sawtooth intervals as well as the magnetic flux opening and closure rates, that is, the dayside and nightside reconnection rates. We find that during the sawtooth intervals the magnetosphere is highly loaded with open flux as a result of the strongly southward IMF carried by the solar wind during these intervals. The magnetosphere tries to relax to a less loaded configuration through a sequence of substorm expansions. However, these substorms do not necessarily evolve to their end before reintensification of nightside reconnection occurs in response to continued loading of the magnetosphere on the dayside.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/29194
DOI :	10.1029/2008GL036374
Other URL :	http://adsabs.harvard.edu/abs/2008GeoRL..3523301H

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