Skirvin, S.J. orcid.org/0000-0002-3814-4232, Fedun, V. orcid.org/0000-0002-0893-7346, Goossens, M. orcid.org/0000-0002-7830-7147 et al. (2 more authors) (2024) Poynting flux of MHD modes in magnetic solar vortex tubes. The Astrophysical Journal, 975 (2). 176. ISSN 0004-637X
Abstract
Magnetic flux tubes in the presence of background rotational flows, known as solar vortex tubes, are abundant throughout the solar atmosphere and may act as conduits for MHD waves to transport magnetic energy to the upper solar atmosphere. We aim to investigate the Poynting flux associated with these waves within solar vortex tubes. We model a solar vortex tube as a straight magnetic flux tube with a background azimuthal velocity component. The MHD wave solutions in the equilibrium configuration of a vortex tube are obtained using the Shooting Eigensolver for SolAr Magnetohydrostatic Equilibria code and we derive an expression for the vertical component of the Poynting flux, Sz, associated with MHD modes. In addition, we present 2D visualizations of the spatial structure of Sz for different MHD modes under different background flow strengths. We show that Sz increases in the presence of a background rotational flow when compared to a flux tube with no rotational flow. When the strength of the background flow is greater than 100 times the strength of the perturbation, the Sz associated with non-axisymmetric (∣m∣ > 0) modes increases by over 1000% when compared to a magnetic flux tube in the absence of a background rotational flow. Furthermore, we present a fundamental property of solar vortices, namely that they cannot solely produce an upward Poynting flux in an untwisted tube, meaning that any observed Sz in straight flux tubes must arise from perturbations, such as MHD waves.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. http://creativecommons.org/licenses/by/4.0/ |
Keywords: | Magnetohydrodynamics (1964); Solar chromosphere (1479); Solar oscillations (1515); Solar atmosphere (1477) |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > School of Electrical and Electronic Engineering The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematical and Physical Sciences |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Nov 2024 16:01 |
Last Modified: | 05 Nov 2024 16:01 |
Status: | Published |
Publisher: | American Astronomical Society |
Refereed: | Yes |
Identification Number: | 10.3847/1538-4357/ad7de1 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:219220 |