Polarisation of decayless kink oscillations of solar coronal loops

Sihui Zhong, Valery M. Nakariakov (), Dmitrii Y. Kolotkov, Lakshmi Pradeep Chitta, Patrick Antolin, Cis Verbeeck and David Berghmans
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Sihui Zhong: University of Warwick
Valery M. Nakariakov: University of Warwick
Dmitrii Y. Kolotkov: University of Warwick
Lakshmi Pradeep Chitta: Max Planck Institute for Solar System Research
Patrick Antolin: Northumbria University
Cis Verbeeck: Royal Observatory of Belgium
David Berghmans: Royal Observatory of Belgium

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract 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.

Date: 2023
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DOI: 10.1038/s41467-023-41029-8

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