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Transverse vertical oscillations during the contraction and expansion of coronal loops View all abstracts by submitter

Qingmin Zhang   Submitted: 2023-05-15 19:21

In this paper, we carry out a detailed analysis of the M1.6 class eruptive flare occurring in NOAA active region 13078 on 2022 August 19. The flare is associated with a fast coronal mass ejection (CME) propagating in the southwest direction with an apparent speed of ∼926 km s-1. Meanwhile, a shock wave is driven by the CME at the flank. The eruption of CME generates an extreme-ultraviolet (EUV) wave expanding outward from the flare site with an apparent speed of ~200 km s-1. As the EUV wave propagates eastward, it encounters and interacts with the low-lying adjacent coronal loops (ACLs), which are composed of two loops. The compression of EUV wave results in contraction, expansion, and transverse vertical oscillations of ACLs. The commencements of contraction are sequential from western to eastern footpoints and the contraction lasts for ~15 minutes. The speeds of contraction lie in the range of 13-40 km s-1 in 171 and 8-54 km s-1 in 193 . A long, gradual expansion follows the contraction at lower speeds. Concurrent vertical oscillations are superposed on contraction and expansion of ACLs. The oscillations last for 2-9 cycles and the amplitudes are ≤4 Mm. The periods are between 3 to 12 minutes with an average value of 6.7 minutes. The results show rich dynamics of coronal loops.

Authors: Qingmin Zhang, Yuhao Zhou, Chuan Li, Qiao Li, Fanxiaoyu Xia, Ye Qiu, Jun Dai, Yanjie Zhang
Projects: SDO-AIA

Publication Status: Accepted for publication in ApJ
Last Modified: 2023-05-17 13:09
Go to main E-Print page  Periodicities in Solar Activity, Solar Radiation and Their Links with Terrestrial Environment  New Evidence on the Origin of Solar Wind Microstreams/Switchbacks  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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