Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations
Magnetohydrodynamic (MHD) waves are often invoked to interpret quasiperiodic pulsations (QPPs) in solar flares. We study the response of a straight flare loop to a kink-like velocity perturbation using three-dimensional MHD simulations and forward model the microwave emissions using the fast gyrosyn...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/acb3c6 |
| _version_ | 1827830908705570816 |
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| author | Mijie Shi Bo Li Shao-Xia Chen Mingzhe Guo Shengju Yuan |
| author_facet | Mijie Shi Bo Li Shao-Xia Chen Mingzhe Guo Shengju Yuan |
| author_sort | Mijie Shi |
| collection | DOAJ |
| description | Magnetohydrodynamic (MHD) waves are often invoked to interpret quasiperiodic pulsations (QPPs) in solar flares. We study the response of a straight flare loop to a kink-like velocity perturbation using three-dimensional MHD simulations and forward model the microwave emissions using the fast gyrosynchrotron code. Kink motions with two periodicities are simultaneously generated, with the long-period component ( P _L = 57 s) being attributed to the radial fundamental kink mode and the short-period component ( P _S = 5.8 s) to the first leaky kink mode. Forward modeling results show that the two-periodic oscillations are detectable in the microwave intensities for some lines of sight. Increasing the beam size to (1″) ^2 does not wipe out the microwave oscillations. We propose that the first leaky kink mode is a promising candidate mechanism to account for short-period QPPs. Radio telescopes with high spatial resolutions can help distinguish between this new mechanism and such customary interpretations as sausage modes. |
| first_indexed | 2024-03-12T04:36:29Z |
| format | Article |
| id | doaj.art-ddc8e9bb303e4aa881f354315470a8ed |
| institution | Directory Open Access Journal |
| issn | 2041-8205 |
| language | English |
| last_indexed | 2024-03-12T04:36:29Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Letters |
| spelling | doaj.art-ddc8e9bb303e4aa881f354315470a8ed2023-09-03T09:55:31ZengIOP PublishingThe Astrophysical Journal Letters2041-82052023-01-019432L1910.3847/2041-8213/acb3c6Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic PulsationsMijie Shi0https://orcid.org/0000-0002-9201-5896Bo Li1https://orcid.org/0000-0003-4790-6718Shao-Xia Chen2https://orcid.org/0000-0002-2421-4981Mingzhe Guo3https://orcid.org/0000-0003-4956-6040Shengju Yuan4Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Institute of Space Sciences, Shandong University , Weihai, Shandong, 264209, People’s Republic of China ; shimijie@sdu.edu.cnShandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Institute of Space Sciences, Shandong University , Weihai, Shandong, 264209, People’s Republic of China ; shimijie@sdu.edu.cnShandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Institute of Space Sciences, Shandong University , Weihai, Shandong, 264209, People’s Republic of China ; shimijie@sdu.edu.cnShandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Institute of Space Sciences, Shandong University , Weihai, Shandong, 264209, People’s Republic of China ; shimijie@sdu.edu.cn; Centre for Mathematical Plasma Astrophysics , Department of Mathematics, KU Leuven, B-3001 Leuven, BelgiumInstitute of Frontier and Interdisciplinary Science, Shandong University , Qingdao, Shandong, 266237, People’s Republic of ChinaMagnetohydrodynamic (MHD) waves are often invoked to interpret quasiperiodic pulsations (QPPs) in solar flares. We study the response of a straight flare loop to a kink-like velocity perturbation using three-dimensional MHD simulations and forward model the microwave emissions using the fast gyrosynchrotron code. Kink motions with two periodicities are simultaneously generated, with the long-period component ( P _L = 57 s) being attributed to the radial fundamental kink mode and the short-period component ( P _S = 5.8 s) to the first leaky kink mode. Forward modeling results show that the two-periodic oscillations are detectable in the microwave intensities for some lines of sight. Increasing the beam size to (1″) ^2 does not wipe out the microwave oscillations. We propose that the first leaky kink mode is a promising candidate mechanism to account for short-period QPPs. Radio telescopes with high spatial resolutions can help distinguish between this new mechanism and such customary interpretations as sausage modes.https://doi.org/10.3847/2041-8213/acb3c6Magnetohydrodynamical simulationsSolar coronaSolar coronal radio emission |
| spellingShingle | Mijie Shi Bo Li Shao-Xia Chen Mingzhe Guo Shengju Yuan Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations The Astrophysical Journal Letters Magnetohydrodynamical simulations Solar corona Solar coronal radio emission |
| title | Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations |
| title_full | Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations |
| title_fullStr | Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations |
| title_full_unstemmed | Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations |
| title_short | Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations |
| title_sort | excitation of multiperiodic kink motions in solar flare loops possible application to quasiperiodic pulsations |
| topic | Magnetohydrodynamical simulations Solar corona Solar coronal radio emission |
| url | https://doi.org/10.3847/2041-8213/acb3c6 |
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