| Issue |
A&A
Volume 678, October 2023
Solar Orbiter First Results (Nominal Mission Phase)
|
|
|---|---|---|
| Article Number | L7 | |
| Number of page(s) | 14 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202347313 | |
| Published online | 12 October 2023 | |
Letter to the Editor
Concurrence of a Kelvin-Helmholtz instability and Kármán vortex street in the Sun’s corona⋆
1
Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, 180 Wenhua Xilu, Weihai, 264209 Shandong, PR China
e-mail: z.huang@sdu.edu.cn; xld@sdu.edu.cn
2
Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, University Road, Belfast, BT7 1NN Northern Ireland, UK
3
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT Surrey, UK
4
Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, 100049
PR China
Received:
29
June
2023
Accepted:
28
September
2023
Context. Instabilities are crucial to understanding the mass transportation and energy transformation in the solar atmosphere. Observations of the concurrence among the Kelvin-Helmholtz instability (KHI) and Kármán vortex street (KVS) in conditions as extreme as the Sun’s corona have yet to be reported.
Aims. We aim to find evidence of a concurrence between the KHI and KVS in the Sun’s corona.
Methods. We analyzed high-resolution data from Extreme Ultraviolet Imager aboard Solar Orbiter and the Atmospheric Imaging Assembly aboard Solar Dynamics Observatory.
Results. Thanks to the high temporal resolution of EUI data, in an interacting region between a jet and coronal plumes, we observed the development of ruffles and breakdown of blobs. The intrinsic parameters of this dynamic system suggest the possibility of both the KHI and KVS occurring in the corona. The observations also show that the coupling of the two instabilities has facilitated the formation of vortices, which may therefore have enhanced the transformation from kinetic energy to thermal energy, as well as mass mixing among systems across magnetic field lines in the Sun’s corona.
Conclusions. The present study reports the very first EUI observations of a concurrence of the KHI and KVS and their coupling in the coronal conditions.
Key words: Sun: corona / Sun: activity / Sun: atmosphere
Movies associated to Figs. C.2 and C.3 are available at https://www.aanda.org.
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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