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IMPACT OF TEMPERATURE-DEPENDENT RESISTIVITY AND THERMAL CONDUCTION ON PLASMOID INSTABILITIES IN CURRENT SHEETS IN THE SOLAR CORONA
Ni L(倪蕾)1,2; Ilia I. Roussev1,3; Lin J(林隽)1; Ziegler, U4; Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL
2012-10-10
Volume758Issue:1
DOI10.1088/0004-637X/758/1/20
Contribution Rank第1完成单位
Indexed BySCI
KeywordInstabilities Magnetic Reconnection Magnetohydrodynamics (Mhd) Sun: Coronal Mass Ejections (Cmes) Sun: Flares
AbstractIn this paper, we investigate, by means of two-dimensional magnetohydrodynamic simulations, the impact of temperature-dependent resistivity and thermal conduction on the development of plasmoid instabilities in reconnecting current sheets in the solar corona. We find that the plasma temperature in the current-sheet region increases with time and it becomes greater than that in the inflow region. As secondary magnetic islands appear, the highest temperature is not always found at the reconnection X-points, but also inside the secondary islands. One of the effects of anisotropic thermal conduction is to decrease the temperature of the reconnecting X-points and transfer the heat into the O-points, the plasmoids, where it gets trapped. In the cases with temperature-dependent magnetic diffusivity, eta similar to T-3/2, the decrease in plasma temperature at the X-points leads to (1) an increase in the magnetic diffusivity until the characteristic time for magnetic diffusion becomes comparable to that of thermal conduction, (2) an increase in the reconnection rate, and (3) more efficient conversion of magnetic energy into thermal energy and kinetic energy of bulk motions. These results provide further explanation of the rapid release of magnetic energy into heat and kinetic energy seen during flares and coronal mass ejections. In this work, we demonstrate that the consideration of anisotropic thermal conduction and Spitzer-type, temperature-dependent magnetic diffusivity, as in the real solar corona, are crucially important for explaining the occurrence of fast reconnection during solar eruptions.
Funding Organizationkey Laboratory of Solar Activity grant [KLSA2011-09] ; Applied Basic Research of Yunnan Province in China [2011FB113] ; NSFC [11147131] ; CAS at the YNAO [KJCX2-EW-T07, 2011T2J01]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
Archive Date2012-09-28
WOS IDWOS:000309520500020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMAGNETIC RECONNECTION ; FLARES ; CODE
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6191
Collection太阳物理研究组
Corresponding AuthorNi, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
Affiliation1.Yunnan Astronomical Observatory, CAS, P.O. Box 110, Kunming 650011, Yunnan, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3.Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA
4.Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam, Germany
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ni L,Ilia I. Roussev,Lin J,et al. IMPACT OF TEMPERATURE-DEPENDENT RESISTIVITY AND THERMAL CONDUCTION ON PLASMOID INSTABILITIES IN CURRENT SHEETS IN THE SOLAR CORONA[J]. ASTROPHYSICAL JOURNAL,2012,758(1).
APA Ni L,Ilia I. Roussev,Lin J,Ziegler, U,&Ni, L .(2012).IMPACT OF TEMPERATURE-DEPENDENT RESISTIVITY AND THERMAL CONDUCTION ON PLASMOID INSTABILITIES IN CURRENT SHEETS IN THE SOLAR CORONA.ASTROPHYSICAL JOURNAL,758(1).
MLA Ni L,et al."IMPACT OF TEMPERATURE-DEPENDENT RESISTIVITY AND THERMAL CONDUCTION ON PLASMOID INSTABILITIES IN CURRENT SHEETS IN THE SOLAR CORONA".ASTROPHYSICAL JOURNAL 758.1(2012).
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