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Large scale coherent magnetohydrodynamic oscillations in a sunspot

Although theoretically predicted, the simultaneous excitation of several resonant modes in sunspots has not been observed. Like any harmonic oscillator, a solar magnetic flux tube can support a variety of resonances, which constitute the natural response of the system to external forcing. Apart from...

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Autores principales: Stangalini, M., Verth, G., Fedun, V., Aldhafeeri, A. A., Jess, D. B., Jafarzadeh, S., Keys, P. H., Fleck, B., Terradas, J., Murabito, M., Ermolli, I., Soler, R., Giorgi, F., MacBride, C. D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8789893/
https://www.ncbi.nlm.nih.gov/pubmed/35079009
http://dx.doi.org/10.1038/s41467-022-28136-8
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author Stangalini, M.
Verth, G.
Fedun, V.
Aldhafeeri, A. A.
Jess, D. B.
Jafarzadeh, S.
Keys, P. H.
Fleck, B.
Terradas, J.
Murabito, M.
Ermolli, I.
Soler, R.
Giorgi, F.
MacBride, C. D.
author_facet Stangalini, M.
Verth, G.
Fedun, V.
Aldhafeeri, A. A.
Jess, D. B.
Jafarzadeh, S.
Keys, P. H.
Fleck, B.
Terradas, J.
Murabito, M.
Ermolli, I.
Soler, R.
Giorgi, F.
MacBride, C. D.
author_sort Stangalini, M.
collection PubMed
description Although theoretically predicted, the simultaneous excitation of several resonant modes in sunspots has not been observed. Like any harmonic oscillator, a solar magnetic flux tube can support a variety of resonances, which constitute the natural response of the system to external forcing. Apart from a few single low order eigenmodes in small scale magnetic structures, several simultaneous resonant modes were not found in extremely large sunspots. Here we report the detection of the largest-scale coherent oscillations observed in a sunspot, with a spectrum significantly different from the Sun’s global acoustic oscillations, incorporating a superposition of many resonant wave modes. Magnetohydrodynamic numerical modeling agrees with the observations. Our findings not only demonstrate the possible excitation of coherent oscillations over spatial scales as large as 30–40 Mm in extreme magnetic flux regions in the solar atmosphere, but also paves the way for their diagnostic applications in other astrophysical contexts.
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spelling pubmed-87898932022-02-07 Large scale coherent magnetohydrodynamic oscillations in a sunspot Stangalini, M. Verth, G. Fedun, V. Aldhafeeri, A. A. Jess, D. B. Jafarzadeh, S. Keys, P. H. Fleck, B. Terradas, J. Murabito, M. Ermolli, I. Soler, R. Giorgi, F. MacBride, C. D. Nat Commun Article Although theoretically predicted, the simultaneous excitation of several resonant modes in sunspots has not been observed. Like any harmonic oscillator, a solar magnetic flux tube can support a variety of resonances, which constitute the natural response of the system to external forcing. Apart from a few single low order eigenmodes in small scale magnetic structures, several simultaneous resonant modes were not found in extremely large sunspots. Here we report the detection of the largest-scale coherent oscillations observed in a sunspot, with a spectrum significantly different from the Sun’s global acoustic oscillations, incorporating a superposition of many resonant wave modes. Magnetohydrodynamic numerical modeling agrees with the observations. Our findings not only demonstrate the possible excitation of coherent oscillations over spatial scales as large as 30–40 Mm in extreme magnetic flux regions in the solar atmosphere, but also paves the way for their diagnostic applications in other astrophysical contexts. Nature Publishing Group UK 2022-01-25 /pmc/articles/PMC8789893/ /pubmed/35079009 http://dx.doi.org/10.1038/s41467-022-28136-8 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Stangalini, M.
Verth, G.
Fedun, V.
Aldhafeeri, A. A.
Jess, D. B.
Jafarzadeh, S.
Keys, P. H.
Fleck, B.
Terradas, J.
Murabito, M.
Ermolli, I.
Soler, R.
Giorgi, F.
MacBride, C. D.
Large scale coherent magnetohydrodynamic oscillations in a sunspot
title Large scale coherent magnetohydrodynamic oscillations in a sunspot
title_full Large scale coherent magnetohydrodynamic oscillations in a sunspot
title_fullStr Large scale coherent magnetohydrodynamic oscillations in a sunspot
title_full_unstemmed Large scale coherent magnetohydrodynamic oscillations in a sunspot
title_short Large scale coherent magnetohydrodynamic oscillations in a sunspot
title_sort large scale coherent magnetohydrodynamic oscillations in a sunspot
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8789893/
https://www.ncbi.nlm.nih.gov/pubmed/35079009
http://dx.doi.org/10.1038/s41467-022-28136-8
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