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Do periods of decayless kink oscillations of solar coronal loops depend on noise?
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Nakariakov, Valery M., Kolotkov, Dmitrii Y. and Zhong, Sihui (2022) Do periods of decayless kink oscillations of solar coronal loops depend on noise? Monthly Notices of the Royal Astronomical Society, 516 (4). pp. 5227-5231. doi:10.1093/mnras/stac2628
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WRAP-Do-periods-of-decayless-kink-oscillations-of-solar-coronal-loops-depend-on-noise-Nakariakov-2022.pdf - Accepted Version - Requires a PDF viewer. Download (1002Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac2628
Abstract
Decayless kink oscillations of solar coronal loops are studied in terms of a low-dimensional model based on a randomly driven Rayleigh oscillator with coefficients experiencing random fluctuations. The model considers kink oscillations as natural modes of coronal loops, decaying by linear resonant absorption. The damping is counteracted by random motions of the loop footpoints and the interaction of the loop with external quasi-steady flows with random fluctuations. In other words, the model combines the self-oscillatory and randomly driven mechanisms for the decayless behaviour. The random signals are taken to be of the stationary red noise nature. In the noiseless case, the model has an asymptotically stationary oscillatory solution, i.e. a kink self-oscillation. It is established that the kink oscillation period is practically independent of noise. This finding justifies the seismological estimations of the kink and Alfvén speeds, and the magnetic field in an oscillating loop by kink oscillations, based on the observed oscillation period. The oscillatory patterns are found to be almost harmonic. Noisy fluctuations of external flows modulate the amplitude of the almost monochromatic oscillatory pattern symmetrically, while random motions of the loop footpoints cause antisymmetric amplitude modulation. Such modulations are also consistent with the observed behaviour.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Sun -- Corona, Helioseismology | ||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
| Publisher: | Oxford University Press | ||||||||||||
| ISSN: | 0035-8711 | ||||||||||||
| Official Date: | November 2022 | ||||||||||||
| Dates: |
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| Volume: | 516 | ||||||||||||
| Number: | 4 | ||||||||||||
| Page Range: | pp. 5227-5231 | ||||||||||||
| DOI: | 10.1093/mnras/stac2628 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 the authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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