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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
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-04-01
Volume18Issue:4
DOI10.1088/1674-4527/18/4/45
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Corona Jet Kelvin-hemholtz Instability Guide-field Method: Numerical Simulations
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[11573064] ; National Natural Science Foundation of China[11203069] ; National Natural Science Foundation of China[11333007] ; National Natural Science Foundation of China[11303101] ; National Natural Science Foundation of China[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] ; NSFC-Guangdong Joint Fund[nsfc2015-460] ; NSFC-Guangdong Joint Fund[nsfc2015-463]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000430282700009
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordHELMHOLTZ INSTABILITY ; PLANAR FLOWS ; RECONNECTION ; FILAMENT ; PARALLEL ; FIELDS ; MHD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12301
Collection太阳物理研究组
Corresponding AuthorNi L(倪蕾)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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