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Parametric study on kink instabilities of twisted magnetic flux ropes in the solar atmosphere
Mei ZX(梅志星)1,2; Keppens, R.1; Roussev, I. I.1,3; Lin J(林隽)2,4
Source PublicationASTRONOMY & ASTROPHYSICS
2018
Volume609
DOI10.1051/0004-6361/201730395
Contribution Rank第2完成单位
Indexed BySCI ; EI
KeywordSun: filaments, prominences Sun: flares magnetic reconnection instabilities magnetohydrodynamics (MHD) Sun: coronal mass ejections (CMEs)
Abstract

Aims. Twisted magnetic flux ropes (MFRs) in the solar atmosphere have been researched extensively because of their close connection to many solar eruptive phenomena, such as flares, filaments, and coronal mass ejections (CMEs). In this work, we performed a set of 3D isothermal magnetohydrodynamic (MHD) numerical simulations, which use analytical twisted MFR models and study dynamical processes parametrically inside and around current-carrying twisted loops. We aim to generalize earlier findings by applying finite plasma beta conditions. 

Methods. Inside the MFR, approximate internal equilibrium is obtained by pressure from gas and toroidal magnetic fields to maintain balance with the poloidal magnetic field. We selected parameter values to isolate best either internal or external kink instability before studying complex evolutions with mixed characteristics. We studied kink instabilities and magnetic reconnection in MFRs with low and high twists. 

Results. The curvature of MFRs is responsible for a tire tube force due to its internal plasma pressure, which tends to expand the MFR. The curvature effect of toroidal field inside the MFR leads to a downward movement toward the photosphere. We obtain an approximate internal equilibrium using the opposing characteristics of these two forces. A typical external kink instability totally dominates the evolution of MFR with infinite twist turns. Because of line-tied conditions and the curvature, the central MFR region loses its external equilibrium and erupts outward. We emphasize the possible role of two different kink instabilities during the MFR evolution: internal and external kink. The external kink is due to the violation of the Kruskal-Shafranov condition, while the internal kink requires a safety factor q = 1 surface inside the MFR. We show that in mixed scenarios, where both instabilities compete, complex evolutions occur owing to reconnections around and within the MFR. The S-shaped structures in current distributions appear naturally without invoking flux emergence. Magnetic reconfigurations common to eruptive MFRs and flare loop systems are found in our simulations.

Funding ProjectBelgian Science Policy Office ; Interuniversity Attraction Poles Programme[IAP P7/08 CHARM] ; Program 973[2013CBA01503] ; NSFC[U1631130] ; NSFC[11273055] ; NSFC[11303088] ; NSFC[11573064] ; NSFC[11403100] ; NSFC[11333007] ; CAS[XDB09040202] ; CAS[QYZDJ-SSW-SLH012]
Funding OrganizationBelgian Science Policy Office ; Interuniversity Attraction Poles Programme[IAP P7/08 CHARM] ; Program 973[2013CBA01503] ; NSFC[U1631130, 11273055, 11303088, 11573064, 11403100, 11333007] ; CAS[XDB09040202, QYZDJ-SSW-SLH012]
Language英语
Subject Area太阳与太阳系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000418963900002
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCoronal Mass Ejections ; X-ray-emission ; Active-region ; Numerical Experiments ; Helicity Injection ; Current Sheets ; Class Flares ; Loops ; Reconnection ; Evolution
EI Accession Number20180204618322
EI KeywordsMagnetohydrodynamics
EI Classification Number615.3magnetohydrodynamics (Mhd) Power Generation - 701.2magnetism: Basic Concepts And Phenomena - 914.1Accidents And Accident Prevention
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12072
Collection太阳物理研究组
Corresponding AuthorMei ZX(梅志星)
Affiliation1.Centre for Mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven, Celestijnenlaan 200B, Leuven; 3001, Belgium
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan; 650011, China
3.Division of Atmospheric and Geospace Sciences, Directorate of Geosciences, National Science Foundation, Arlington; VA; 22314, United States
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing; 100012, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Mei ZX,Keppens, R.,Roussev, I. I.,et al. Parametric study on kink instabilities of twisted magnetic flux ropes in the solar atmosphere[J]. ASTRONOMY & ASTROPHYSICS,2018,609.
APA Mei ZX,Keppens, R.,Roussev, I. I.,&Lin J.(2018).Parametric study on kink instabilities of twisted magnetic flux ropes in the solar atmosphere.ASTRONOMY & ASTROPHYSICS,609.
MLA Mei ZX,et al."Parametric study on kink instabilities of twisted magnetic flux ropes in the solar atmosphere".ASTRONOMY & ASTROPHYSICS 609(2018).
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