What drives decayless kink oscillations in active-region coronal loops on the Sun?

Mandal, Sudip, Chitta, Lakshmi Pradeep, Antolin, Patrick, Peter, Hardi, Solanki, Sami K., Auchère, Frédéric, Berghmans, David, Zhukov, Andrei N., Teriaca, Luca, Cuadrado, Regina A., Schühle, Udo, Parenti, Susanna, Buchlin, Éric, Harra, Louise, Verbeeck, Cis, Kraaikamp, Emil, Long, David M., Rodriguez, Luciano, Pelouze, Gabriel, Schwanitz, Conrad, Barczynski, Krzysztof and Smith, Phil J. (2022) What drives decayless kink oscillations in active-region coronal loops on the Sun? Astronomy & Astrophysics, 666. L2. ISSN 0004-6361

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Official URL: https://doi.org/10.1051/0004-6361/202244403


Here, we present a study of the phenomena of decayless kink oscillations in a system of active-region (AR) coronal loops. Using high-resolution observations from two different instruments, namely the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, we follow these AR loops for an hour each on three consecutive days. Our results show significantly more resolved decayless waves in the higher resolution EUI data compared with the AIA data. Furthermore, the same system of loops exhibits many of these decayless oscillations on Day 2, while we detect very few oscillations on Day 3, and find none at all on Day 1. Analysis of photospheric magnetic field data reveals that, most of the time, these loops were rooted in sunspots, where supergranular flows are generally absent. This suggests that supergranular flows, which are often invoked as drivers of decayless waves, are not necessarily driving such oscillations in our observations. Similarly, our findings also cast doubt on other possible drivers of these waves, such as a transient driver or mode conversion of longitudinal waves near the loop footpoints. In conclusion, our analysis suggests that none of the commonly suspected sources proposed to drive decayless oscillations in active-region loops seem to be operating in this event, and therefore the search for that elusive wave driver needs to continue.

Item Type: Article
Additional Information: Funding Information: L.P.C. gratefully acknowledges funding by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council (grant agreement No 101039844). Neither the European Union nor the granting authority can be held responsible for them. S.P. acknowledges the funding by CNES through the MEDOC data and operations center. D.M.L. is grateful to the Science Technology and Facilities Council for the award of an Ernest Rutherford Fellowship (ST/R003246/1). P.A. acknowledges STFC support from Ernest Rutherford Fellowship grant number ST/R004285/2. The ROB team thanks the Belgian Federal Science Policy Office (BELSPO) for the provision of financial support in the framework of the PRODEX Programme of the European Space Agency (ESA) under contract numbers 4000134474 and 4000136424. Solar Orbiter is a space mission of international collaboration between ESA and NASA, operated by ESA. The EUI instrument was built by CSL, IAS, MPS, MSSL/UCL, PMOD/WRC, ROB, LCF/IO with funding from the Belgian Federal Science Policy Office (BELSPO/PRODEX PEA 4000134088); the Centre National d’Etudes Spatiales (CNES); the UK Space Agency (UKSA); the Bundesministerium für Wirtschaft und Energie (BMWi) through the Deutsches Zentrum für Luft- und Raumfahrt (DLR); and the Swiss Space Office (SSO). AIA is an instrument on board the Solar Dynamics Observatory, a mission for NASA’s Living With a Star program. AIA and HMI data are courtesy of NASA/SDO and the AIA, EVE, and HMI science teams. This research has made use of NASA’s Astrophysics Data System. The authors would also like to acknowledge the Joint Science Operations Center (JSOC) for providing the AIA data download links.
Uncontrolled Keywords: Sun: corona, Sun: magnetic fields, Sun: oscillations, Sun: transition region, Sun: UV radiation
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 14 Nov 2022 10:40
Last Modified: 14 Nov 2022 10:45
URI: https://nrl.northumbria.ac.uk/id/eprint/50636

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