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Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities
Ni, Lei1,2; Zhang, Qing-Min3; Murphy, Nicholas A.4; Lin, Jun1
2017-05-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume841Issue:1Pages:16
Corresponding AuthorNi, Lei(leini@ynao.ac.cn)
AbstractWe 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.
Keywordinstabilities magnetic reconnection magnetohydrodynamics (MHD) methods: numerical Sun: activity
DOI10.3847/1538-4357/aa6ffe
WOS KeywordX-RAY JETS ; CHROMOSPHERIC ANEMONE JETS ; EXTREME-ULTRAVIOLET JETS ; MOVING MAGNETIC FEATURES ; H-ALPHA SURGES ; NUMERICAL-SIMULATION ; FLUX EMERGENCE ; SOLAR MICROFLARES ; ATOMIC DATABASE ; RECONNECTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000402310500013
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23022
Collection中国科学院紫金山天文台
Corresponding AuthorNi, Lei
Affiliation1.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Guandu Dist 650216, Kunming, Peoples R China
2.Chinese Acad Sci, Ctr Astron Megasci, 20A Datun Rd, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
Recommended Citation
GB/T 7714
Ni, Lei,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):16.
APA Ni, Lei,Zhang, Qing-Min,Murphy, Nicholas A.,&Lin, Jun.(2017).Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities.ASTROPHYSICAL JOURNAL,841(1),16.
MLA Ni, Lei,et al."Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin-Helmholtz Instabilities".ASTROPHYSICAL JOURNAL 841.1(2017):16.
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