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NUMERICAL EXPERIMENTS ON THE DETAILED ENERGY CONVERSION AND SPECTRUM STUDIES IN A CORONA CURRENT SHEET
Ni L(倪蕾)1,2; Lin J(林隽)1; Mei ZX(梅志星)1; Li Y(李燕)1; Ni, L (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2015-10-20
卷号812期号:2
DOI10.1088/0004-637X/812/2/92
产权排序第1完成单位
收录类别SCI
关键词Magnetic Reconnection Methods: Numerical Magnetohydrodynamics (Mhd) Shock Waves Sun: Corona
摘要In this paper, we study the energy conversion and spectra in a corona current sheet (CS) by 2.5 dimensional MHD numerical simulations. Numerical results show that many Petschek-like fine structures with slow-mode shocks mediated by plasmoid instabilities develop during the magnetic reconnection process. The termination shocks can also be formed above the primary magnetic island and at the head of secondary islands. These shocks play important roles in generating thermal energy in a corona CS. For a numerical simulation with initial conditions close to the solar corona environment, the ratio of the generated thermal energy to the total dissipated magnetic energy is around 1/5 before secondary islands appear. After secondary islands appear, the generated thermal energy starts to increase sharply and this ratio can reach a value of about 3/5. In an environment with a relatively lower plasma density and plasma beta, the plasma can be heated to a much higher temperature. After secondary islands appear, the one-dimensional energy spectra along the CS do not behave as a simple power law and the spectrum index increases with the wave number. The average spectrum index for the magnetic energy spectrum along the CS is about 1.8. The two-dimensional spectra intuitively show that part of the high energy is cascaded to large kx and ky space after secondary islands appear. The plasmoid distribution function calculated from numerical simulations behaves as a power law closer to f (psi) similar to psi(-1) in the intermediate psi regime. By using eta(eff) = v(inflow) . L, the effective magnetic diffusivity is estimated to be about 10(11) similar to 10(12) m(2) s(-1).
项目资助者NSFC [11203069, 11273055, 11333007] ; Key Laboratory of Solar Activity [KLSA201404] ; Western Light of Chinese Academy of Sciences ; Program 973 grant [2013CBA01503] ; CAS [KJCX2-EW-T07, XDB09040202] ; Yunnan Astronomical Observatories
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2015-10-26
WOS记录号WOS:000365206600004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CURRENT-LAYER FRAGMENTATION ; EJECTION CURRENT SHEETS ; BAND DM-SPIKES ; X-RAY SOURCE ; SOLAR-FLARE ; MAGNETIC RECONNECTION ; CASCADING RECONNECTION ; KELVIN-HELMHOLTZ ; SUPRA-ARCADE ; ERUPTION
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6262
专题太阳物理研究组
通讯作者Ni, L (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
推荐引用方式
GB/T 7714
Ni L,Lin J,Mei ZX,et al. NUMERICAL EXPERIMENTS ON THE DETAILED ENERGY CONVERSION AND SPECTRUM STUDIES IN A CORONA CURRENT SHEET[J]. ASTROPHYSICAL JOURNAL,2015,812(2).
APA Ni L,Lin J,Mei ZX,Li Y,&Ni, L .(2015).NUMERICAL EXPERIMENTS ON THE DETAILED ENERGY CONVERSION AND SPECTRUM STUDIES IN A CORONA CURRENT SHEET.ASTROPHYSICAL JOURNAL,812(2).
MLA Ni L,et al."NUMERICAL EXPERIMENTS ON THE DETAILED ENERGY CONVERSION AND SPECTRUM STUDIES IN A CORONA CURRENT SHEET".ASTROPHYSICAL JOURNAL 812.2(2015).
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