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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; Auchere, Frederic; Berghmans, David; ... Smith, Phil J; + view all (2022) What drives decayless kink oscillations in active-region coronal loops on the Sun? Astronomy & Astrophysics , 666 , Article L2. 10.1051/0004-6361/202244403. Green open access

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Abstract

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.

Type: Article
Title: What drives decayless kink oscillations in active-region coronal loops on the Sun?
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202244403
Publisher version: https://doi.org/10.1051/0004-6361/202244403
Language: English
Additional information: Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Sun: corona, Sun: magnetic fields, Sun: UV radiation, Sun: oscillations, Sun: transition region
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10157633
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