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dc.contributor.authorXing, C.
dc.contributor.authorCheng, X.
dc.contributor.authorQiu, Jiong
dc.contributor.authorHu, Qiang
dc.contributor.authorPriest, E. R.
dc.contributor.authorDing, M. D.
dc.identifier.citationXing , C , Cheng , X , Qiu , J , Hu , Q , Priest , E R & Ding , M D 2020 , ' Quantifying the toroidal flux of preexisting flux ropes of coronal mass ejections ' , Astrophysical Journal , vol. 889 , no. 2 , 125 .
dc.identifier.otherORCID: /0000-0003-3621-6690/work/74117743
dc.descriptionFunding: SOHO is a project of international cooperation between ESA and NASA. C.X., X.C. and M.D.D. are funded by NSFC grants 11722325, 11733003, 11790303, 11790300, Jiangsu NSF grants BK20170011, and "Dengfeng B" program of Nanjing University.en
dc.description.abstractIn past decades, much progress has been achieved in understanding the origin and evolution of coronal mass ejections (CMEs). In situ observations of the counterparts of CMEs, especially magnetic clouds (MCs) near the Earth, have provided measurements of the structure and total flux of CME flux ropes. However, it has been difficult to measure these properties in an erupting CME flux rope, in particular in a preexisting flux rope. In this work, we propose a model to estimate the toroidal flux of a preexisting flux rope by subtracting the flux contributed by magnetic reconnection during the eruption from the flux measured in the MC. The flux contributed by the reconnection is derived from geometric properties of two-ribbon flares based on a quasi-2D reconnection model. We then apply the model to four CME/flare events and find that the ratio of toroidal flux in the preexisting flux rope to that in the associated MC lies in the range 0.40–0.88. This indicates that the toroidal flux of the preexisting flux rope makes an important contribution to that of the CME flux rope and is usually at least as large as the flux arising from the eruption process for the selected events.
dc.relation.ispartofAstrophysical Journalen
dc.subjectSolar coronaen
dc.subjectSolar coronal mass ejectionsen
dc.subjectSolar flaresen
dc.subjectQA Mathematicsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectSpace and Planetary Scienceen
dc.subjectAstronomy and Astrophysicsen
dc.titleQuantifying the toroidal flux of preexisting flux ropes of coronal mass ejectionsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.description.statusPeer revieweden

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