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dc.contributor.authorPagano, Paolo
dc.contributor.authorDe Moortel, Ineke
dc.date.accessioned2019-01-10T15:30:04Z
dc.date.available2019-01-10T15:30:04Z
dc.date.issued2019-03
dc.identifier.citationPagano , P & De Moortel , I 2019 , ' Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating ' , Astronomy & Astrophysics , vol. 623 , A37 . https://doi.org/10.1051/0004-6361/201834158en
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 257290684
dc.identifier.otherPURE UUID: 51f3394d-7886-4006-8541-22f7d47ec590
dc.identifier.otherArXiv: http://arxiv.org/abs/1901.02310v1
dc.identifier.otherORCID: /0000-0002-1452-9330/work/54818735
dc.identifier.otherScopus: 85062710338
dc.identifier.otherWOS: 000459752800001
dc.identifier.urihttps://hdl.handle.net/10023/16835
dc.description.abstractContext. Whilst there are observational indications that transverse MHD waves carry enough energy to maintain the thermal structure of the solar corona, it is not clear whether such energy can be efficiently and effectively converted into heating. Phase-mixing of Alfvén waves is considered a candidate mechanism, as it can develop transverse gradient where magnetic energy can be converted into thermal energy. However, phase-mixing is a process that crucially depends on the amplitude and period of the transverse oscillations, and only recently have we obtained a complete measurement of the power spectrum for transverse oscillations in the corona. Aims. We aim to investigate the heating generated by phase-mixing of transverse oscillations triggered by buffeting of a coronal loop that follows from the observed coronal power spectrum as well as the impact of these persistent oscillations on the structure of coronal loops. Methods. We consider a 3D MHD model of an active region coronal loop and we perturb its footpoints with a 2D horizontal driver that represents a random buffeting motion of the loop footpoints. Our driver is composed of 1000 pulses superimposed to generate the observed power spectrum. Results. We find that the heating supply from the observed power spectrum in the solar corona through phase mixing is not sufficient to maintain the million degree active region solar corona. We also find that the development of Kelvin-Helmholtz instabilities could be a common phenomenon in coronal loops that could affect their apparent life time. Conclusions. This study concludes that is unlikely that phase-mixing of Alfvén waves resulting from an observed power spectrum of transverse coronal loop oscillations can heat the active region solar corona. However, transverse waves could play an important role in the development of small scale structures.
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysicsen
dc.rights© 2019, ESO. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1051/0004-6361/201834158en
dc.subjectMagnetohydrodynamics (MHD)en
dc.subjectSun: atmosphereen
dc.subjectSun: coronaen
dc.subjectSun: magnetic fieldsen
dc.subjectSun: oscillationsen
dc.subjectWavesen
dc.subjectQA Mathematicsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectT-NDASen
dc.subject.lccQAen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleContribution of observed multi frequency spectrum of Alfvén waves to coronal heatingen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Research Councilen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201834158
dc.description.statusPeer revieweden
dc.identifier.grantnumber647214en
dc.identifier.grantnumberST/N000609/1en


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