IMPACT OF TEMPERATURE-DEPENDENT RESISTIVITY AND THERMAL CONDUCTION ON PLASMOID INSTABILITIES IN CURRENT SHEETS IN THE SOLAR CORONA
文献类型：期刊论文
| 作者 | Ni L(倪蕾)1,2 ; Ilia I. Roussev1,3; Lin J(林隽)1; Ziegler, U4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-10-10 |
| 卷号 | 758期号:1 |
| 关键词 | instabilities magnetic reconnection magnetohydrodynamics (MHD) Sun: coronal mass ejections (CMEs) Sun: flares |
| ISSN号 | 0004-637X |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Yunnan, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MAGNETIC RECONNECTION ; FLARES ; CODE |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-637X/758/1/20/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000309520500020 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/6191]  |
| 专题 | 云南天文台_太阳物理研究组 |
| 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 |
| 推荐引用方式 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.(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). |
入库方式： OAI收割
来源：云南天文台
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