Damping Scenarios of Kink Oscillations of Solar Coronal Loops
The transition from the large-amplitude rapidly-decaying regime of kink oscillations of plasma loops observed in the corona of the Sun to the low-amplitude decayless oscillations is modelled. In this study, the decayless regime is associated with the energy supply from coronal plasma flows, i.e., se...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/9/2/95 |
| _version_ | 1797617931951013888 |
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| author | Valery M. Nakariakov Naga V. Yelagandula |
| author_facet | Valery M. Nakariakov Naga V. Yelagandula |
| author_sort | Valery M. Nakariakov |
| collection | DOAJ |
| description | The transition from the large-amplitude rapidly-decaying regime of kink oscillations of plasma loops observed in the corona of the Sun to the low-amplitude decayless oscillations is modelled. In this study, the decayless regime is associated with the energy supply from coronal plasma flows, i.e., self-oscillations, or random movements of footpoints of the oscillating loop. The damping is attributed to the linear effect of resonant absorption. We demonstrate that the decay of an impulsively excited kink oscillation to the self-oscillatory stationary amplitude differs from the exponential decay. The damping time is found to depend on the oscillation amplitude to the power of a negative constant whose magnitude is less than unity. In this scenario, a better model for the damping seems to be super-exponential. In the separately considered case of the decayless oscillatory regime supported by a random driver, the oscillation amplitude experiences an exponential decay to the decayless level. Implications of this finding for magnetohydrodynamic seismology of the solar corona based on the effect of resonant absorption are discussed. |
| first_indexed | 2024-03-11T08:03:02Z |
| format | Article |
| id | doaj.art-93b0a83b23b648459505aa3cf011f33b |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-11T08:03:02Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-93b0a83b23b648459505aa3cf011f33b2023-11-16T23:40:52ZengMDPI AGUniverse2218-19972023-02-01929510.3390/universe9020095Damping Scenarios of Kink Oscillations of Solar Coronal LoopsValery M. Nakariakov0Naga V. Yelagandula1Centro de Investigacion en Astronomía, Universidad Bernardo O’Higgins, Avenida Viel 1497, Santiago 8370993, ChileSpecial Astrophysical Observatory of RAS, 369167 Nizhny Arkhyz, RussiaThe transition from the large-amplitude rapidly-decaying regime of kink oscillations of plasma loops observed in the corona of the Sun to the low-amplitude decayless oscillations is modelled. In this study, the decayless regime is associated with the energy supply from coronal plasma flows, i.e., self-oscillations, or random movements of footpoints of the oscillating loop. The damping is attributed to the linear effect of resonant absorption. We demonstrate that the decay of an impulsively excited kink oscillation to the self-oscillatory stationary amplitude differs from the exponential decay. The damping time is found to depend on the oscillation amplitude to the power of a negative constant whose magnitude is less than unity. In this scenario, a better model for the damping seems to be super-exponential. In the separately considered case of the decayless oscillatory regime supported by a random driver, the oscillation amplitude experiences an exponential decay to the decayless level. Implications of this finding for magnetohydrodynamic seismology of the solar corona based on the effect of resonant absorption are discussed.https://www.mdpi.com/2218-1997/9/2/95magnetohydrodynamic wavessolar coronamagnetohydrodynamic seismology |
| spellingShingle | Valery M. Nakariakov Naga V. Yelagandula Damping Scenarios of Kink Oscillations of Solar Coronal Loops Universe magnetohydrodynamic waves solar corona magnetohydrodynamic seismology |
| title | Damping Scenarios of Kink Oscillations of Solar Coronal Loops |
| title_full | Damping Scenarios of Kink Oscillations of Solar Coronal Loops |
| title_fullStr | Damping Scenarios of Kink Oscillations of Solar Coronal Loops |
| title_full_unstemmed | Damping Scenarios of Kink Oscillations of Solar Coronal Loops |
| title_short | Damping Scenarios of Kink Oscillations of Solar Coronal Loops |
| title_sort | damping scenarios of kink oscillations of solar coronal loops |
| topic | magnetohydrodynamic waves solar corona magnetohydrodynamic seismology |
| url | https://www.mdpi.com/2218-1997/9/2/95 |
| work_keys_str_mv | AT valerymnakariakov dampingscenariosofkinkoscillationsofsolarcoronalloops AT nagavyelagandula dampingscenariosofkinkoscillationsofsolarcoronalloops |