Quasi-periodic oscillations of flare loops and slipping motion of ribbon substructures during a C-class flare
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866909241507315712 |
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| author | Zhang, Yining Li, Ting Ye, Jing |
| author_facet | Zhang, Yining Li, Ting Ye, Jing |
| contents | Quasi-periodic oscillations in solar flaring emission have been observed over the past few decades. To date, the underpinning processes resulting in the quasi-periodic oscillations remain unknown. In this paper, we report a unique event that exhibits both the long-duration quasi-periodic intensity oscillations of flare loops and the quasi-periodic slipping motion of ribbon substructures during a C9.1-class flare (SOL2015-03-15-T01:15), using the observations from Solar Dynamics Observatory and Interface Region Imaging Spectrograph. The high-temperature flare loops rooted in the straight part of ribbons display a "bright-dim" intensity oscillation, with a period of about 4.5 minutes. The oscillation starts just after the flare onset and lasts over 3 hours. Meanwhile, the substructures within the ribbon tip display the quasi-periodic slipping motion along the ribbon at 1400 Åimages which has a similar periodicity to the stationary intensity oscillation of the flare loops in the straight part of the flare ribbons. We suggest that the quasi-periodic pattern is probably related to the loop-top dynamics caused by the reconnection outflow impinging on the flare loops. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03639 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quasi-periodic oscillations of flare loops and slipping motion of ribbon substructures during a C-class flare Zhang, Yining Li, Ting Ye, Jing Solar and Stellar Astrophysics Quasi-periodic oscillations in solar flaring emission have been observed over the past few decades. To date, the underpinning processes resulting in the quasi-periodic oscillations remain unknown. In this paper, we report a unique event that exhibits both the long-duration quasi-periodic intensity oscillations of flare loops and the quasi-periodic slipping motion of ribbon substructures during a C9.1-class flare (SOL2015-03-15-T01:15), using the observations from Solar Dynamics Observatory and Interface Region Imaging Spectrograph. The high-temperature flare loops rooted in the straight part of ribbons display a "bright-dim" intensity oscillation, with a period of about 4.5 minutes. The oscillation starts just after the flare onset and lasts over 3 hours. Meanwhile, the substructures within the ribbon tip display the quasi-periodic slipping motion along the ribbon at 1400 Åimages which has a similar periodicity to the stationary intensity oscillation of the flare loops in the straight part of the flare ribbons. We suggest that the quasi-periodic pattern is probably related to the loop-top dynamics caused by the reconnection outflow impinging on the flare loops. |
| title | Quasi-periodic oscillations of flare loops and slipping motion of ribbon substructures during a C-class flare |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2407.03639 |