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Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities
Ni L(倪蕾)1,2; Zhang, Qing-Min3; Murphy, Nicholas A.4; Lin J(林隽)1
发表期刊ASTROPHYSICAL JOURNAL
2017-05-20
卷号841期号:1
DOI10.3847/1538-4357/aa6ffe
产权排序第1完成单位
收录类别SCI
关键词Instabilities Magnetic Reconnection Magnetohydrodynamics (Mhd) Methods: Numerical Sun: Activity
摘要

We perform 2D resistive magnetohydrodynamic simulations of coronal jets driven by flux emergence along the lower boundary. The reconnection layers are susceptible to the formation of blobs that are ejected in the jet. Our simulation with low plasma beta (Case I) shows that magnetic islands form easily and propagate upward in the jet. These islands are multithermal and thus are predicted to show up in hot channels (335 angstrom and 211 angstrom) and the cool channel (304 angstrom) in observations by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory. The islands have maximum temperatures of 8 MK, lifetimes of 120 s, diameters of 6 Mm, and velocities of 200 km s(-1). These parameters are similar to the properties of blobs observed in extreme-ultraviolet (EUV) jets by AIA. The Kelvin-Helmholtz instability develops in our simulation with moderately high plasma beta (Case II) and leads to the formation of bright vortex-like blobs above the multiple high magnetosonic Mach number regions that appear along the jet. These vortex-like blobs can also be identified in the AIA channels. However, they eventually move downward and disappear after the high magnetosonic Mach number regions disappear. In the lower plasma beta case, the lifetime for the jet is shorter, the jet and magnetic islands are formed with higher velocities and temperatures, the current-sheet fragments are more chaotic, and more magnetic islands are generated. Our results show that the plasmoid instability and Kelvin-Helmholtz instability along the jet are both possible causes of the formation of blobs observed at EUV wavelengths.

资助项目NSFC[11573064] ; NSFC[11203069] ; NSFC[11273055] ; NSFC[11333007] ; NSFC[11303101] ; NSFC[11403100] ; Western Light of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Key Laboratory of Solar Activity[KLSA201404] ; Program 973[2013CBA01503] ; Youth Fund of Jiangsu Province[BK20161618] ; CAS[XDB09040202] ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund[nsfc2015-460] ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund[nsfc2015-463] ; NSF SHINE[AGS-1156076] ; NSF SHINE[AGS-1358432] ; DOE through the NSF/DOE Partnership in Basic Plasma Science and Engineering[DE-SC0016363]
项目资助者NSFC[11573064, 11203069, 11273055, 11333007, 11303101, 11403100] ; Western Light of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Key Laboratory of Solar Activity[KLSA201404] ; Program 973[2013CBA01503] ; Youth Fund of Jiangsu Province[BK20161618] ; CAS[XDB09040202] ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund[nsfc2015-460, nsfc2015-463] ; NSF SHINE[AGS-1156076, AGS-1358432] ; DOE through the NSF/DOE Partnership in Basic Plasma Science and Engineering[DE-SC0016363]
语种英语
学科领域天文学 ; 太阳与太阳系 ; 太阳物理学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
归档日期2017-07-12
WOS记录号WOS:000402310500013
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]X-ray Jets ; Chromospheric Anemone Jets ; Extreme-ultraviolet Jets ; Moving Magnetic Features ; H-alpha Surges ; Numerical-simulation ; Flux Emergence ; Solar Microflares ; Atomic Database ; Reconnection
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/10087
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, 396 Yangfangwang, Guandu District, Kunming, 650216, China
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China
3.Key Laboratory for Dark Matter and Space Science, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
4.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
推荐引用方式
GB/T 7714
Ni L,Zhang, Qing-Min,Murphy, Nicholas A.,et al. Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities[J]. ASTROPHYSICAL JOURNAL,2017,841(1).
APA Ni L,Zhang, Qing-Min,Murphy, Nicholas A.,&Lin J.(2017).Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities.ASTROPHYSICAL JOURNAL,841(1).
MLA Ni L,et al."Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities".ASTROPHYSICAL JOURNAL 841.1(2017).
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