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题名:
Magnetic reconnection in the low solar chromosphere with a more realistic radiative cooling model
作者: Ni L(倪蕾)1,2; Lukin, Vyacheslav S.3; Murphy, Nicholas A.4; Lin, Jun1,2
刊名: PHYSICS OF PLASMAS
出版日期: 2018-04-01
卷号: 25, 期号:4
DOI: 10.1063/1.5018351
学科分类: 天文学
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Ni L(倪蕾) , Email: leini@ynao.ac.cn
英文摘要: Magnetic reconnection is the most likely mechanism responsible for the high temperature events that are observed in strongly magnetized locations around the temperature minimum in the low solar chromosphere. This work improves upon our previous work [Ni et al., Astrophys. J. 852, 95 (2018)] by using a more realistic radiative cooling model computed from the OPACITY project and the CHIANTI database. We find that the rate of ionization of the neutral component of the plasma is still faster than recombination within the current sheet region. For low beta plasmas, the ionized and neutral fluid flows are well-coupled throughout the reconnection region resembling the single-fluid Sweet-Parker model dynamics. Decoupling of the ion and neutral inflows appears in the higher beta case with beta(0) = 1.46, which leads to a reconnection rate about three times faster than the rate predicted by the Sweet-Parker model. In all cases, the plasma temperature increases with time inside the current sheet, and the maximum value is above 2 x 10(4) K when the reconnection magnetic field strength is greater than 500 G. While the more realistic radiative cooling model does not result in qualitative changes of the characteristics of magnetic reconnection, it is necessary for studying the variations of the plasma temperature and ionization fraction inside current sheets in strongly magnetized regions of the low solar atmosphere. It is also important for studying energy conversion during the magnetic reconnection process when the hydrogen-dominated plasma approaches full ionization. Published by AIP Publishing.
项目资助者: NSFC(11573064, 11203069, 11333007, 11303101, 11403100) ; Western Light of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Program 973(2013CBA01503) ; NSFC-CAS Joint Grant(U1631130) ; CAS(QYZDJ-SSW-SLH012) ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund(nsfc2015-460, nsfc2015-463, U1501501) ; U.S. National Science Foundation (NSF) ; NSF SHINE Grant(AGS-1358342) ; DOE(DE-SC0016363)
语种: 英语
原文出处: 查看原文
ISSN号: 1070-664X
文章类型: Article
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Physics
类目[WOS]: Physics, Fluids & Plasmas
关键词[WOS]: ELLERMAN BOMBS ; AMBIPOLAR DIFFUSION ; FLUX EMERGENCE ; SIMULATIONS ; ATMOSPHERE
WOS记录号: WOS:000431142200043
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内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12366
Appears in Collections:太阳物理研究组_期刊论文

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作者单位: 1.Yunnan Observatories, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan 650216,
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District,
3.National Science Foundation, 2415 Eisenhower Avenue, Alexandria, Virginia 22314, USA
4.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA

Recommended Citation:
Ni L,Lukin, Vyacheslav S.,Murphy, Nicholas A.,et al. Magnetic reconnection in the low solar chromosphere with a more realistic radiative cooling model[J]. PHYSICS OF PLASMAS,2018,25(4).
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