Multilayered Kelvin–Helmholtz Instability in the Solar Corona
Yuan,Ding1,2; Shen,Yuandeng3; Liu,Yu3; Li,Hongbo4; Feng,Xueshang1; Keppens,Rony5,6,7
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract The 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 ? 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 ?. 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.
Keywordinstabilities magnetohydrodynamics (MHD) Sun: atmosphere Sun: corona
WOS IDIOP:2041-8205-884-2-ab4bcd
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China;,
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
3.Yunnan Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China
4.Institute of Space Physics, Luoyang Normal University, Luoyang 471934, People's Republic of China
5.Centre for mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven, Celestijnenlaan 200B, Leuven 3001, Belgium
6.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People's Republic of China
7.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yuan,Ding,Shen,Yuandeng,Liu,Yu,等. Multilayered Kelvin–Helmholtz Instability in the Solar Corona[J]. The Astrophysical Journal Letters,2019,884(2).
APA Yuan,Ding,Shen,Yuandeng,Liu,Yu,Li,Hongbo,Feng,Xueshang,&Keppens,Rony.(2019).Multilayered Kelvin–Helmholtz Instability in the Solar Corona.The Astrophysical Journal Letters,884(2).
MLA Yuan,Ding,et al."Multilayered Kelvin–Helmholtz Instability in the Solar Corona".The Astrophysical Journal Letters 884.2(2019).
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