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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.
发表期刊ASTROPHYSICAL JOURNAL
2012-10-10
卷号758期号:1
DOI10.1088/0004-637X/758/1/20
产权排序第1完成单位
收录类别SCI
关键词Instabilities Magnetic Reconnection Magnetohydrodynamics (Mhd) Sun: Coronal Mass Ejections (Cmes) Sun: Flares
摘要In 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.
项目资助者key 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]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2012-09-28
WOS记录号WOS:000309520500020
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MAGNETIC RECONNECTION ; FLARES ; CODE
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6191
专题太阳物理研究组
通讯作者Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.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
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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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