Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF B-x Component During Southward IMF

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Hoilijoki , S , Ganse , U , Sibeck , D G , Cassak , P A , Turc , L , Battarbee , M , Fear , R C , Blanco-Cano , X , Dimmock , A P , Kilpua , E K J , Jarvinen , R , Juusola , L , Pfau-Kempf , Y & Palmroth , M 2019 , ' Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF B-x Component During Southward IMF ' , Journal of geophysical research. Space physics , vol. 124 , no. 6 , pp. 4037-4048 . https://doi.org/10.1029/2019JA026821

Title: Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF B-x Component During Southward IMF
Author: Hoilijoki, S.; Ganse, U.; Sibeck, D.G.; Cassak, P.A.; Turc, L.; Battarbee, M.; Fear, R.C.; Blanco-Cano, X.; Dimmock, A.P.; Kilpua, E.K.J.; Jarvinen, R.; Juusola, L.; Pfau-Kempf, Y.; Palmroth, M.
Other contributor: University of Helsinki, Space Physics Research Group
University of Helsinki, Space Physics Research Group
University of Helsinki, Space Physics Research Group
University of Helsinki, Space Physics Research Group
University of Helsinki, Space Physics Research Group
University of Helsinki, Staff Services
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics



Date: 2019-06
Language: eng
Number of pages: 12
Belongs to series: Journal of geophysical research. Space physics
ISSN: 2169-9380
DOI: https://doi.org/10.1029/2019JA026821
URI: http://hdl.handle.net/10138/306643
Abstract: This paper describes properties and behavior of magnetic reconnection and flux transfer events (FTEs) on the dayside magnetopause using the global hybrid-Vlasov code Vlasiator. We investigate two simulation runs with and without a sunward (positive)B-x component of the interplanetary magnetic field (IMF) when the IMF is southward. The runs are two-dimensional in real space in the noon-midnight meridional (polar) plane and three-dimensional in velocity space. Solar wind input parameters are identical in the two simulations with the exception that the IMF is purely southward in one but tilted 45 degrees toward the Sun in the other. In the purely southward case (i.e., without B-x) the magnitude of the magnetos heath magnetic field component tangential to the magnetopause is larger than in the run with a sunward tilt. This is because the shock normal is perpendicular to the IMF at the equatorial plane, whereas in the other run the shock configuration is oblique and a smaller fraction of the total IMF strength is compressed at the shock crossing. Hence, the measured average and maximum reconnection rate are larger in the purely southward run. The run with tilted IMF also exhibits a north-south asymmetry in the tangential magnetic field caused by the different angle between the IMF and the bow shock normal north and south of the equator. Greater north-south asymmetries are seen in the FTE occurrence rate, size, and velocity as well; FTEs moving toward the Southern Hemisphere are larger in size and observed less frequently than FTEs in the Northern Hemisphere.
Subject: magnetic reconnection
magnetopause
flux transfer event
numerical modeling
hybrid-Vlasov
114 Physical sciences
115 Astronomy, Space science
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