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The Helicity Sign of Flux Transfer Event Flux Ropes and Its Relationship to the Guide Field and Hall Physics in Magnetic Reconnection at the Magnetopause

hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorDAHANI, S.
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorKIEOKAEW, R.
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorGÉNOT, V.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorLAVRAUD, B.
dc.contributor.authorCHEN, Y.
hal.structure.identifierLaboratoire de Physique des Plasmas [LPP]
dc.contributor.authorMICHOTTE DE WELLE, B.
hal.structure.identifierLaboratoire de Physique des Plasmas [LPP]
dc.contributor.authorAUNAI, N.
hal.structure.identifierUniversity of Michigan [Ann Arbor]
dc.contributor.authorTÓTH, G.
hal.structure.identifierWest Virginia University [Morgantown]
dc.contributor.authorCASSAK, P.
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorFARGETTE, N.
hal.structure.identifierUniversity of Southampton
dc.contributor.authorFEAR, R.
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorMARCHAUDON, Aurélie
hal.structure.identifierAstrochemistry Laboratory [Greenbelt]
dc.contributor.authorGERSHMAN, D.
hal.structure.identifierAstrochemistry Laboratory [Greenbelt]
dc.contributor.authorGILES, B.
hal.structure.identifierUniversity of New Hampshire [UNH]
dc.contributor.authorTORBERT, R.
hal.structure.identifierSouthwest Research Institute [San Antonio] [SwRI]
dc.contributor.authorBURCH, J.
dc.date.issued2022-11
dc.identifier.issn2169-9380
dc.description.abstractEnAbstract Flux Transfer Events (FTEs) are transient magnetic flux ropes typically found at the Earth's magnetopause on the dayside. While it is known that FTEs are generated by magnetic reconnection, it remains unclear how the details of magnetic reconnection controls their properties. A recent study showed that the helicity sign of FTEs positively correlates with the east‐west ( B y ) component of the Interplanetary Magnetic Field (IMF). With data from the Cluster and Magnetospheric Multiscale missions, we performed a statistical study of 166 quasi force‐free FTEs. We focus on their helicity sign and possible association with upstream solar wind conditions and local magnetic reconnection properties. Using both in situ data and magnetic shear modeling, we find that FTEs whose helicity sign corresponds to the IMF B y are associated with moderate magnetic shears while those that do not correspond to the IMF B y are associated with higher magnetic shears. While uncertainty in IMF propagation to the magnetopause may lead to randomness in the determination of the flux rope core field and helicity, we rather propose that for small IMF B y , which corresponds to high shear and low guide field, the Hall pattern of magnetic reconnection determines the FTE core field and helicity sign. In that context we explain how the temporal sequence of multiple X‐line formation and the reconnection rate are important in determining the flux rope helicity sign. This work highlights a fundamental connection between kinetic processes at work in magnetic reconnection and the macroscale structure of FTEs.
dc.language.isoen
dc.publisherAmerican Geophysical Union/Wiley
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enThe Helicity Sign of Flux Transfer Event Flux Ropes and Its Relationship to the Guide Field and Hall Physics in Magnetic Reconnection at the Magnetopause
dc.typeArticle de revue
dc.identifier.doi10.1029/2022JA030686
dc.subject.halPlanète et Univers [physics]
bordeaux.journalJournal of Geophysical Research Space Physics
bordeaux.volume127
bordeaux.issue11
bordeaux.peerReviewedoui
hal.identifierhal-04279266
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04279266v1
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