Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF Bx Component During Southward IMF
Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF Bx Component During Southward IMF
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) Bx 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° toward the Sun in the other. In the purely southward case (i.e., without Bx) the magnitude of the magnetosheath 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.
flux transfer event, hybrid-Vlasov, magnetic reconnection, magnetopause, numerical modeling
Hoilijoki, S.
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Ganse, U.
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Sibeck, D. G.
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Cassak, P. A.
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Turc, L.
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Battarbee, M.
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Fear, R. C.
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Blanco-Cano, X.
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Dimmock, A. P.
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Kilpua, E. K.J.
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Jarvinen, R.
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Juusola, L.
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Pfau-Kempf, Y.
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Palmroth, M.
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Hoilijoki, S.
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Ganse, U.
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Sibeck, D. G.
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Cassak, P. A.
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Turc, L.
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Battarbee, M.
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Fear, R. C.
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Blanco-Cano, X.
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Dimmock, A. P.
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Kilpua, E. K.J.
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Jarvinen, R.
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Juusola, L.
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Pfau-Kempf, Y.
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Palmroth, M.
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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. and Palmroth, M.
(2019)
Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF Bx Component During Southward IMF.
Journal of Geophysical Research: Space Physics.
(doi:10.1029/2019JA026821).
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) Bx 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° toward the Sun in the other. In the purely southward case (i.e., without Bx) the magnitude of the magnetosheath 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.
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Hoilijoki_et_al-2019-Journal_of_Geophysical_Research__Space_Physics
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Accepted/In Press date: 22 April 2019
e-pub ahead of print date: 1 May 2019
Keywords:
flux transfer event, hybrid-Vlasov, magnetic reconnection, magnetopause, numerical modeling
Identifiers
Local EPrints ID: 432105
URI: http://eprints.soton.ac.uk/id/eprint/432105
ISSN: 2169-9380
PURE UUID: 746bd32b-f449-48fd-9bc3-db7fd6bb2e4e
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Date deposited: 02 Jul 2019 16:30
Last modified: 16 Mar 2024 07:58
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Contributors
Author:
S. Hoilijoki
Author:
U. Ganse
Author:
D. G. Sibeck
Author:
P. A. Cassak
Author:
L. Turc
Author:
M. Battarbee
Author:
X. Blanco-Cano
Author:
A. P. Dimmock
Author:
E. K.J. Kilpua
Author:
R. Jarvinen
Author:
L. Juusola
Author:
Y. Pfau-Kempf
Author:
M. Palmroth
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