Kink Oscillations of Coronal Loops
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Published:2021-08-30
Issue:6
Volume:217
Page:
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ISSN:0038-6308
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Container-title:Space Science Reviews
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language:en
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Short-container-title:Space Sci Rev
Author:
Nakariakov V. M.ORCID, Anfinogentov S. A., Antolin P., Jain R., Kolotkov D. Y., Kupriyanova E. G., Li D., Magyar N., Nisticò G., Pascoe D. J., Srivastava A. K., Terradas J., Vasheghani Farahani S., Verth G., Yuan D., Zimovets I. V.
Abstract
AbstractKink oscillations of coronal loops, i.e., standing kink waves, is one of the most studied dynamic phenomena in the solar corona. The oscillations are excited by impulsive energy releases, such as low coronal eruptions. Typical periods of the oscillations are from a few to several minutes, and are found to increase linearly with the increase in the major radius of the oscillating loops. It clearly demonstrates that kink oscillations are natural modes of the loops, and can be described as standing fast magnetoacoustic waves with the wavelength determined by the length of the loop. Kink oscillations are observed in two different regimes. In the rapidly decaying regime, the apparent displacement amplitude reaches several minor radii of the loop. The damping time which is about several oscillation periods decreases with the increase in the oscillation amplitude, suggesting a nonlinear nature of the damping. In the decayless regime, the amplitudes are smaller than a minor radius, and the driver is still debated. The review summarises major findings obtained during the last decade, and covers both observational and theoretical results. Observational results include creation and analysis of comprehensive catalogues of the oscillation events, and detection of kink oscillations with imaging and spectral instruments in the EUV and microwave bands. Theoretical results include various approaches to modelling in terms of the magnetohydrodynamic wave theory. Properties of kink oscillations are found to depend on parameters of the oscillating loop, such as the magnetic twist, stratification, steady flows, temperature variations and so on, which make kink oscillations a natural probe of these parameters by the method of magnetohydrodynamic seismology.
Funder
ISSI-BJ science and technology facilities council российский фонд фундаментальных исследований newton fund uk-india education and research initiative national natural science foundation of china shenzhen technology development program
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Astronomy and Astrophysics
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