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Strong core magnetic fields in magnetopause flux transfer events
Author(s) -
Scholer Manfred
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i008p00748
Subject(s) - magnetopause , physics , magnetic field , field line , flux (metallurgy) , geophysics , magnetic flux , magnetosphere , field (mathematics) , line of force , core (optical fiber) , magnetic reconnection , computational physics , earth's magnetic field , materials science , mathematics , quantum mechanics , pure mathematics , optics , metallurgy
Magnetic field measurements in flux transfer events (FTEs) at the Earth's magnetopause often reveal the existence of a strong core magnetic field. We describe a possible mechanism for the origin of such strong core fields in the framework of a recently proposed model for FTEs. In this model bursty reconnection at a single X line, which extends over a large longitude segment, leads to loop like magnetic fields. As these loops move due to the Maxwell stress along the magnetopause, the magnetopause magnetic field directed perpendicular to the loops is swept up and correspondingly enhanced. When the downward pulling force due to the stress of the swept up magnetopause field equals the upward pulling force due to the loops an electromagnetic force equilibrium is reached. The core field strength determined by the force balance is proportional to the longitude extent of the reconnection line. Events with a large core field are therefore expected to have a higher detection probability than events with a small core field.