| Issue |
A&A
Volume 674, June 2023
|
|
|---|---|---|
| Article Number | A167 | |
| Number of page(s) | 6 | |
| Section | The Sun and the Heliosphere | |
| DOI | https://doi.org/10.1051/0004-6361/202345836 | |
| Published online | 19 June 2023 | |
An extreme-ultraviolet wave associated with the possible expansion of sheared arcades⋆
1
Institute of Space Sciences, Shandong University, 180 Wenhuaxi Road, Weihai, 264209
PR China
e-mail: ruishengzheng@sdu.edu.cn
2
Institute of Frontier and Interdisciplinary Science, Shandong University, 72 Binhai Road, Qingdao, 266237
PR China
3
CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing, 100101
PR China
4
School of Astronomy and Space Science, University of Chinese Academy of Sciences, 1 Yanqihu East Road, Beijing, 101408
PR China
Received:
1
January
2023
Accepted:
19
April
2023
Context. Solar extreme-ultraviolet (EUV) waves are propagating disturbances in the corona, and they are usually accompanied with various solar eruptions, from large-scale coronal mass ejections to small-scale coronal jets.
Aims. Generally, it is believed that EUV waves are driven by the rapid expansion of coronal loops overlying the erupting cores. In this paper, we present an exception of an EUV wave that was not triggered by the expansion of coronal loops overlying the erupting core.
Methods. Combining the multiwavelength observations from multiple instruments, we studied the event in detail.
Results. The eruption was restricted in the active region (AR) and disturbed the nearby sheared arcades (SAs) connecting the source AR to a remote AR. Interestingly, following the disturbance, an EUV wave formed close to the SAs, but far away from the eruption source.
Conclusions. All the results show that the EUV wave had a closer temporal and spatial relationship with the disappearing part of SAs than the confined eruption. Hence, we suggest that the EUV wave was likely triggered by the expansion of some strands of SAs, rather than the expansion of erupting loops. It can be a possible complement for the driving mechanisms of EUV waves.
Key words: Sun: activity / Sun: corona / Sun: magnetic fields
Movies associated to Figs. 2–4, and 6 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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