Magnetic Shocks and Substructures Excited by Torsional Alfvén Wave Interactions in Merging Expanding Flux Tubes

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorSnow, B.en_US
dc.contributor.authorFedun, V.en_US
dc.contributor.authorGent, F. A.en_US
dc.contributor.authorVerth, G.en_US
dc.contributor.authorErdélyi, R.en_US
dc.contributor.departmentDepartment of Computer Scienceen
dc.contributor.groupauthorCentre of Excellence Research on Solar Long-Term Variability and Effects, ReSoLVEen
dc.contributor.groupauthorProfessorship Vehtari Akien
dc.contributor.organizationUniversity of Sheffielden_US
dc.date.accessioned2018-05-22T14:37:54Z
dc.date.available2018-05-22T14:37:54Z
dc.date.issued2018-04-20en_US
dc.description.abstractVortex motions are frequently observed on the solar photosphere. These motions may play a key role in the transport of energy and momentum from the lower atmosphere into the upper solar atmosphere, contributing to coronal heating. The lower solar atmosphere also consists of complex networks of flux tubes that expand and merge throughout the chromosphere and upper atmosphere. We perform numerical simulations to investigate the behavior of vortex-driven waves propagating in a pair of such flux tubes in a non-force-free equilibrium with a realistically modeled solar atmosphere. The two flux tubes are independently perturbed at their footpoints by counter-rotating vortex motions. When the flux tubes merge, the vortex motions interact both linearly and nonlinearly. The linear interactions generate many small-scale transient magnetic substructures due to the magnetic stress imposed by the vortex motions. Thus, an initially monolithic tube is separated into a complex multithreaded tube due to the photospheric vortex motions. The wave interactions also drive a superposition that increases in amplitude until it exceeds the local Mach number and produces shocks that propagate upward with speeds of approximately 50 km s-1. The shocks act as conduits transporting momentum and energy upward, and heating the local plasma by more than an order of magnitude, with a peak temperature of approximately 60,000 K. Therefore, we present a new mechanism for the generation of magnetic waveguides from the lower solar atmosphere to the solar corona. This wave guide appears as the result of interacting perturbations in neighboring flux tubes. Thus, the interactions of photospheric vortex motions is a potentially significant mechanism for energy transfer from the lower to upper solar atmosphere.en
dc.description.versionPeer revieweden
dc.format.extent1-8
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationSnow, B, Fedun, V, Gent, F A, Verth, G & Erdélyi, R 2018, ' Magnetic Shocks and Substructures Excited by Torsional Alfvén Wave Interactions in Merging Expanding Flux Tubes ', The Astrophysical Journal, vol. 857, no. 2, 125, pp. 1-8 . https://doi.org/10.3847/1538-4357/aab7f7en
dc.identifier.doi10.3847/1538-4357/aab7f7en_US
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.otherPURE UUID: 62f0c0f1-16dc-4a1d-9586-79fdac19d22fen_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/62f0c0f1-16dc-4a1d-9586-79fdac19d22fen_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85046408318&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/21174534/Snow_2018_ApJ_857_125.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/30946
dc.identifier.urnURN:NBN:fi:aalto-201805222386
dc.language.isoenen
dc.relation.ispartofseriesAstrophysical Journalen
dc.relation.ispartofseriesVolume 857, issue 2en
dc.rightsopenAccessen
dc.subject.keywordmagnetohydrodynamics (MHD)en_US
dc.subject.keywordshock wavesen_US
dc.subject.keywordSun: chromosphereen_US
dc.subject.keywordSun: magnetic fieldsen_US
dc.subject.keywordSun: oscillationsen_US
dc.titleMagnetic Shocks and Substructures Excited by Torsional Alfvén Wave Interactions in Merging Expanding Flux Tubesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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