Polarisation of decayless kink oscillations of solar coronal loops.

Autor: Zhong S; Centre for Fusion, Space and Astrophysics, Physics Department, University of Warwick, Coventry, CV4 7AL, UK., Nakariakov VM; Centre for Fusion, Space and Astrophysics, Physics Department, University of Warwick, Coventry, CV4 7AL, UK. V.Nakariakov@warwick.ac.uk.; Centro de Investigacion en Astronomía, Universidad Bernardo O'Higgins, Avenida Viel 1497, Santiago, Chile. V.Nakariakov@warwick.ac.uk., Kolotkov DY; Centre for Fusion, Space and Astrophysics, Physics Department, University of Warwick, Coventry, CV4 7AL, UK.; Engineering Research Institute 'Ventspils International Radio Astronomy Centre (VIRAC)' of Ventspils University of Applied Sciences, Inzenieru iela 101, Ventspils, LV-3601, Latvia., Chitta LP; Max Planck Institute for Solar System Research, D-37077, Göttingen, Germany., Antolin P; Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK., Verbeeck C; Solar-Terrestrial Centre of Excellence - SIDC, Royal Observatory of Belgium, Ringlaan -3- Av. Circulaire, Brussels, 1180, Belgium., Berghmans D; Solar-Terrestrial Centre of Excellence - SIDC, Royal Observatory of Belgium, Ringlaan -3- Av. Circulaire, Brussels, 1180, Belgium.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Sep 12; Vol. 14 (1), pp. 5298. Date of Electronic Publication: 2023 Sep 12.
DOI: 10.1038/s41467-023-41029-8
Abstrakt: Decayless kink oscillations of plasma loops in the solar corona may contain an answer to the enigmatic problem of solar and stellar coronal heating. The polarisation of the oscillations gives us a unique information about their excitation mechanisms and energy supply. However, unambiguous determination of the polarisation has remained elusive. Here, we show simultaneous detection of a 4-min decayless kink oscillation from two non-parallel lines-of-sights, separated by about 104 ∘ , provided by unique combination of the High Resolution Imager on Solar Orbiter and the Atmospheric Imaging Assembly on Solar Dynamics Observatory. The observations reveal a horizontal or weakly oblique linear polarisation of the oscillation. This conclusion is based on the comparison of observational results with forward modelling of the observational manifestation of various kinds of polarisation of kink oscillations. The revealed polarisation favours the sustainability of these oscillations by quasi-steady flows which may hence supply the energy for coronal heating.
(© 2023. Springer Nature Limited.)
Databáze: MEDLINE
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