Reference : An evaluation of the contributions of the distant and near-Earth neutral lines to magnet...

	Document type :	Scientific congresses and symposiums : Unpublished conference
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics Physical, chemical, mathematical & earth Sciences : Physics Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/86465

Title :	An evaluation of the contributions of the distant and near-Earth neutral lines to magnetotail reconnection rates and magnetic flux closure
Language :	English
Author, co-author :	Milan, Steve [University of Leicester, Physics and Astronomy, Leicester, United Kingdom (steve.milan@ion.le.ac.uk)]
	Boakes, Peter [University of Leicester, Physics and Astronomy, Leicester, United Kingdom (steve.milan@ion.le.ac.uk)]
	Imber, Suzanne [Heliophysics Division, Godard Space Flight Center, USA]
	Hubert, Benoît [University of Liege, Liege, Belgium]
Publication date :	1-May-2010
Abstract :	[en] The expanding-contracting polar cap paradigm relates the dayside and nightside rates of magnetic reconnection to changes in the size of the ionospheric polar cap, the amount of magnetic flux in the magnetotail lobes, and the excitation of ionospheric and magnetospheric plasma convection. Expansions of the polar cap are the consequence of dayside reconnection, the merging of interplanetary magnetic flux with the terrestrial dipole to increase the proportion of the dipole that is open. Contractions of the polar cap are caused by magnetic reconnection in the magnetotail at a distant neutral (or X-) line (DXL) and near-Earth neutral line (NEXL), the latter especially during substorms, to reduce the open flux in the magnetosphere. There is debate surrounding the proportion of flux closure provided by the DXL and NEXL, and hence whether substorms dominate the nightside contribution to ionospheric and magnetospheric convection. This study utilizes a 7-day interval of auroral observations from the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite and convection measurements by the Super Dual Auroral Radar Network (SuperDARN) to quantify the nightside rates of reconnection during substorm and non-substorm periods and hence investigate DXL and NEXL flux closure.
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/86465
Other URL :	http://adsabs.harvard.edu/abs/2010EGUGA..12.9015M

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