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Multilayered Kelvin-Helmholtz Instability in the Solar Corona
Yuan, Ding1,2; Shen, Yuandeng3; Liu, Yu3; Li, Hongbo4; Feng, Xueshang1; Keppens, Rony5,6,7
2019-10-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume884Issue:2Pages:5
Corresponding AuthorYuan, Ding(yuanding@hit.edu.cn)
AbstractThe Kelvin-Helmholtz (KH) instability is commonly found in many astrophysical, laboratory, and space plasmas. It could mix plasma components of different properties and convert dynamic fluid energy from large-scale structure to smaller ones. In this study, we combined the ground-based New Vacuum Solar Telescope (NVST) and the Solar Dynamic Observatories/Atmospheric Imaging Assembly (AIA) to observe the plasma dynamics associated with active region 12673 on 2017 September 9. In this multitemperature view, we identified three adjacent layers of plasma flowing at different speeds, and detected KH instabilities at their interfaces. We could unambiguously track a typical KH vortex and measure its motion. We found that the speed of this vortex suddenly tripled at a certain stage. This acceleration was synchronized with the enhancements in emission measure and average intensity of the 193 A data. We interpret this as evidence that KH instability triggers plasma heating. The intriguing feature in this event is that the KH instability observed in the NVST channel was nearly complementary to that in the AIA 193 A. Such a multithermal energy exchange process is easily overlooked in previous studies, as the cold plasma component is usually not visible in the extreme-ultraviolet channels that are only sensitive to high-temperature plasma emissions. Our finding indicates that embedded cold layers could interact with hot plasma as invisible matters. We speculate that this process could occur at a variety of length scales and could contribute to plasma heating.
Keywordmagnetohydrodynamics (MHD) Sun: atmosphere Sun: corona
DOI10.3847/2041-8213/ab4bcd
WOS KeywordPLASMA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000516538200024
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35874
Collection中国科学院紫金山天文台
Corresponding AuthorYuan, Ding
Affiliation1.Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen 518055, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Yunnan, Peoples R China
4.Luoyang Normal Univ, Inst Space Phys, Luoyang 471934, Peoples R China
5.Katholieke Univ Leuven, Dept Math, Ctr Math Plasma Astrophys, Celestijnenlaan 200B, B-3001 Leuven, Belgium
6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China
7.Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Ding,Shen, Yuandeng,Liu, Yu,et al. Multilayered Kelvin-Helmholtz Instability in the Solar Corona[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,884(2):5.
APA Yuan, Ding,Shen, Yuandeng,Liu, Yu,Li, Hongbo,Feng, Xueshang,&Keppens, Rony.(2019).Multilayered Kelvin-Helmholtz Instability in the Solar Corona.ASTROPHYSICAL JOURNAL LETTERS,884(2),5.
MLA Yuan, Ding,et al."Multilayered Kelvin-Helmholtz Instability in the Solar Corona".ASTROPHYSICAL JOURNAL LETTERS 884.2(2019):5.
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