Properties of magnetic reconnection and FTEs on the dayside magnetopause with and without positive IMF Bх component during southward IMF

S. Hoilijoki, U. Ganse, D.G. Sibeck, P.A. Cassak, L. Turc, M. Battarbee, R.C. Fear, X. Blanco-Cano, A.P. Dimmock, E.K.J. Kilpua, R. Jarvinen, L. Juusola, Y. Pfau-Kempf, M. Palmroth

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

Abstract This paper describes properties and behavior of magnetic reconnection and flux transfer events (FTE) on the dayside magnetopause using the global hybrid-Vlasov code Vlasiator. We investigate two simulation runs with and without a sunward (positive) B? 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° towards the Sun in the other. In the purely southward case (i.e., without B?) 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 towards the southern hemisphere are larger in size and observed less frequently than FTEs in the northern hemisphere.
Alkuperäiskielienglanti
LehtiJournal of geophysical research. Space physics
Vuosikerta0
Numeroja
ISSN2169-9380
DOI - pysyväislinkit
TilaJulkaistu - 1 toukokuuta 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 114 Fysiikka
  • 115 Avaruustieteet ja tähtitiede

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title = "Properties of magnetic reconnection and FTEs on the dayside magnetopause with and without positive IMF Bх component during southward IMF",
abstract = "Abstract This paper describes properties and behavior of magnetic reconnection and flux transfer events (FTE) on the dayside magnetopause using the global hybrid-Vlasov code Vlasiator. We investigate two simulation runs with and without a sunward (positive) B? 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° towards the Sun in the other. In the purely southward case (i.e., without B?) 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 towards the southern hemisphere are larger in size and observed less frequently than FTEs in the northern hemisphere.",
keywords = "magnetic reconnection, magnetopause, flux transfer event, numerical modeling, hybrid-Vlasov, 114 Physical sciences, 115 Astronomy, Space science",
author = "S. Hoilijoki and U. Ganse and D.G. Sibeck and P.A. Cassak and L. Turc and M. Battarbee and R.C. Fear and X. Blanco-Cano and A.P. Dimmock and E.K.J. Kilpua and R. Jarvinen and L. Juusola and Y. Pfau-Kempf and M. Palmroth",
year = "2019",
month = "5",
day = "1",
doi = "10.1029/2019JA026821",
language = "English",
volume = "0",
journal = "Journal of geophysical research. Space physics",
issn = "2169-9380",
publisher = "John Wiley & Sons, Ltd",
number = "ja",

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Properties of magnetic reconnection and FTEs on the dayside magnetopause with and without positive IMF Bх component during southward IMF. / 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.

julkaisussa: Journal of geophysical research. Space physics, Vuosikerta 0, Nro ja, 01.05.2019.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Properties of magnetic reconnection and FTEs on the dayside magnetopause with and without positive IMF Bх component during southward IMF

AU - Hoilijoki, S.

AU - Ganse, U.

AU - Sibeck, D.G.

AU - Cassak, P.A.

AU - Turc, L.

AU - Battarbee, M.

AU - Fear, R.C.

AU - Blanco-Cano, X.

AU - Dimmock, A.P.

AU - Kilpua, E.K.J.

AU - Jarvinen, R.

AU - Juusola, L.

AU - Pfau-Kempf, Y.

AU - Palmroth, M.

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Abstract This paper describes properties and behavior of magnetic reconnection and flux transfer events (FTE) on the dayside magnetopause using the global hybrid-Vlasov code Vlasiator. We investigate two simulation runs with and without a sunward (positive) B? 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° towards the Sun in the other. In the purely southward case (i.e., without B?) 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 towards the southern hemisphere are larger in size and observed less frequently than FTEs in the northern hemisphere.

AB - Abstract This paper describes properties and behavior of magnetic reconnection and flux transfer events (FTE) on the dayside magnetopause using the global hybrid-Vlasov code Vlasiator. We investigate two simulation runs with and without a sunward (positive) B? 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° towards the Sun in the other. In the purely southward case (i.e., without B?) 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 towards the southern hemisphere are larger in size and observed less frequently than FTEs in the northern hemisphere.

KW - magnetic reconnection

KW - magnetopause

KW - flux transfer event

KW - numerical modeling

KW - hybrid-Vlasov

KW - 114 Physical sciences

KW - 115 Astronomy, Space science

U2 - 10.1029/2019JA026821

DO - 10.1029/2019JA026821

M3 - Article

VL - 0

JO - Journal of geophysical research. Space physics

JF - Journal of geophysical research. Space physics

SN - 2169-9380

IS - ja

ER -