Transverse motions in sunspot super-penumbral fibrils

Morton, Richard, Mooroogen, K. and Henriques, V. M. J. (2021) Transverse motions in sunspot super-penumbral fibrils. Philosophical Transactions of the Royal Society A: Mathematical Physical and Engineering Sciences, 379 (2190). p. 20200183. ISSN 1364-503X

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Official URL: https://doi.org/10.1098/rsta.2020.0183

Abstract

Sunspots have played a key role in aiding our understanding of magnetohydrodynamic (MHD) wave phenomena in the Sun's atmosphere, and it is well known they demonstrate a number of wave phenomena associated with slow MHD modes. Recent studies have shown that transverse wave modes are present throughout the majority of the chromosphere. Using high-resolution Ca II 8542 Å observations from the Swedish Solar Telescope, we provide the first demonstration that the chromospheric super-penumbral fibrils, which span out from the sunspot, also show ubiquitous transverse motions. We interpret these motions as transverse waves, in particular the MHD kink mode. We compile the statistical properties of over 2000 transverse motions to find distributions for periods and amplitudes, finding they are broadly consistent with previous observations of chromospheric transverse waves in quiet Sun fibrils. The very presence of the waves in super-penumbral fibrils raises important questions about how they are generated, and could have implications for our understanding of how MHD wave energy is transferred through the atmosphere of a sunspot. This article is part of the Theo Murphy meeting issue 'High-resolution wave dynamics in the lower solar atmosphere'.

Item Type: Article
Uncontrolled Keywords: Sun: chromosphere, magnetohydrodynamics (MHD), waves, Sun: oscillations
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 06 Jan 2021 09:45
Last Modified: 07 Jan 2021 16:03
URI: http://nrl.northumbria.ac.uk/id/eprint/45123

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