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Numerical studies of the Kelvin-Hemholtz instability in a coronal jet
Zhao TL(赵天乐)1,2,3; Ni L(倪蕾)1,3; Lin J(林隽)1,3; Ziegler, Udo4
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-04-01
卷号18期号:4
DOI10.1088/1674-4527/18/4/45
产权排序第1完成单位
收录类别SCI
关键词Sun: Corona Jet Kelvin-hemholtz Instability Guide-field Method: Numerical Simulations
摘要Kelvin-Hemholtz (K-H) instability in a coronal EUV jet is studied via 2.5D MHD numerical simulations. The jet results from magnetic reconnection due to the interaction of the newly emerging magnetic field and the pre-existing magnetic field in the corona. Our results show that the Alfven Mach number along the jet is about 5-14 just before the instability occurs, and it is even higher than 14 at some local areas. During the K-H instability process, several vortex-like plasma blobs with high temperature and high density appear along the jet, and magnetic fields have also been rolled up and the magnetic configuration including anti-parallel magnetic fields forms, which leads to magnetic reconnection at many X-points and current sheet fragments inside the vortex-like blob. After magnetic islands appear inside the main current sheet, the total kinetic energy of the reconnection outflows decreases, and cannot support the formation of the vortex-like blob along the jet any longer, then the K-H instability eventually disappears. We also present the results about how the guide field and flux emerging speed affect the K-H instability. We find that a strong guide field inhibits shock formation in the reconnecting upward outflow regions but helps secondary magnetic islands appear earlier in the main current sheet, and then apparently suppresses the K-H instability. As the speed of the emerging magnetic field decreases, the K-H instability appears later, the highest temperature inside the vortex blob gets lower and the vortex structure gets smaller.
项目资助者National Natural Science Foundation of China(11573064, 11203069, 11333007, 11303101, 11403100) ; National Basic Research Program of China (973 program)(2013CBA01503) ; NSFC-CAS Joint Fund(U1631130) ; CAS(QYZDJ-SSW-SLH012) ; Western Light of Chinese Academy of Sciences ; Youth Innovation Promotion Association, CAS ; Key Laboratory of Solar Activity(KLSA201404) ; NSFC-Guangdong Joint Fund(U1501501, nsfc2015-460, nsfc2015-463)
语种英语
学科领域天文学
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000430282700009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]HELMHOLTZ INSTABILITY ; PLANAR FLOWS ; RECONNECTION ; FILAMENT ; PARALLEL ; FIELDS ; MHD
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12301
专题太阳物理研究组
通讯作者Ni L(倪蕾)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100101, China
4.Leibniz-Institut für Astrophysik Potsdam, Potsdam D-14482, Germany
推荐引用方式
GB/T 7714
Zhao TL,Ni L,Lin J,et al. Numerical studies of the Kelvin-Hemholtz instability in a coronal jet[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(4).
APA Zhao TL,Ni L,Lin J,&Ziegler, Udo.(2018).Numerical studies of the Kelvin-Hemholtz instability in a coronal jet.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(4).
MLA Zhao TL,et al."Numerical studies of the Kelvin-Hemholtz instability in a coronal jet".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.4(2018).
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