Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection

Detalhes bibliográficos
Autor(a) principal: Passos, Dario
Data de Publicação: 2015
Outros Autores: Charbonneau, Paul, Miesch, Mark
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/11309
Resumo: The form of solar meridional circulation is a very important ingredient for mean field flux transport dynamo models. However, a shroud of mystery still surrounds this large-scale flow, given that its measurement using current helioseismic techniques is challenging. In this work, we use results from three-dimensional global simulations of solar convection to infer the dynamical behavior of the established meridional circulation. We make a direct comparison between the meridional circulation that arises in these simulations and the latest observations. Based on our results, we argue that there should be an equatorward flow at the base of the convection zone at mid-latitudes, below the current maximum depth helioseismic measures can probe (0.75 R-circle dot). We also provide physical arguments to justify this behavior. The simulations indicate that the meridional circulation undergoes substantial changes in morphology as the magnetic cycle unfolds. We close by discussing the importance of these dynamical changes for current methods of observation which involve long averaging periods of helioseismic data. Also noteworthy is the fact that these topological changes indicate a rich interaction between magnetic fields and plasma flows, which challenges the ubiquitous kinematic approach used in the vast majority of mean field dynamo simulations.
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spelling Meridional circulation dynamics from 3D magnetohydrodynamic global solar convectionLatitudinal DistributionDifferential rotationMagnetic-fieldFlowCycleShearModelThe form of solar meridional circulation is a very important ingredient for mean field flux transport dynamo models. However, a shroud of mystery still surrounds this large-scale flow, given that its measurement using current helioseismic techniques is challenging. In this work, we use results from three-dimensional global simulations of solar convection to infer the dynamical behavior of the established meridional circulation. We make a direct comparison between the meridional circulation that arises in these simulations and the latest observations. Based on our results, we argue that there should be an equatorward flow at the base of the convection zone at mid-latitudes, below the current maximum depth helioseismic measures can probe (0.75 R-circle dot). We also provide physical arguments to justify this behavior. The simulations indicate that the meridional circulation undergoes substantial changes in morphology as the magnetic cycle unfolds. We close by discussing the importance of these dynamical changes for current methods of observation which involve long averaging periods of helioseismic data. Also noteworthy is the fact that these topological changes indicate a rich interaction between magnetic fields and plasma flows, which challenges the ubiquitous kinematic approach used in the vast majority of mean field dynamo simulations.Fundacao para a Ciencia e Tecnologia [SFRH/BPD/68409/2010]; POPH/FSE; GRPS-UdeM; Natural Sciences and Engineering Research Council of Canada; National Science FoundationIop Publishing LtdSapientiaPassos, DarioCharbonneau, PaulMiesch, Mark2018-12-07T14:53:00Z2015-022015-02-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/11309eng2041-820510.1088/2041-8205/800/1/L18info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:23:05Zoai:sapientia.ualg.pt:10400.1/11309Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:02:49.981629Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
title Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
spellingShingle Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
Passos, Dario
Latitudinal Distribution
Differential rotation
Magnetic-field
Flow
Cycle
Shear
Model
title_short Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
title_full Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
title_fullStr Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
title_full_unstemmed Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
title_sort Meridional circulation dynamics from 3D magnetohydrodynamic global solar convection
author Passos, Dario
author_facet Passos, Dario
Charbonneau, Paul
Miesch, Mark
author_role author
author2 Charbonneau, Paul
Miesch, Mark
author2_role author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Passos, Dario
Charbonneau, Paul
Miesch, Mark
dc.subject.por.fl_str_mv Latitudinal Distribution
Differential rotation
Magnetic-field
Flow
Cycle
Shear
Model
topic Latitudinal Distribution
Differential rotation
Magnetic-field
Flow
Cycle
Shear
Model
description The form of solar meridional circulation is a very important ingredient for mean field flux transport dynamo models. However, a shroud of mystery still surrounds this large-scale flow, given that its measurement using current helioseismic techniques is challenging. In this work, we use results from three-dimensional global simulations of solar convection to infer the dynamical behavior of the established meridional circulation. We make a direct comparison between the meridional circulation that arises in these simulations and the latest observations. Based on our results, we argue that there should be an equatorward flow at the base of the convection zone at mid-latitudes, below the current maximum depth helioseismic measures can probe (0.75 R-circle dot). We also provide physical arguments to justify this behavior. The simulations indicate that the meridional circulation undergoes substantial changes in morphology as the magnetic cycle unfolds. We close by discussing the importance of these dynamical changes for current methods of observation which involve long averaging periods of helioseismic data. Also noteworthy is the fact that these topological changes indicate a rich interaction between magnetic fields and plasma flows, which challenges the ubiquitous kinematic approach used in the vast majority of mean field dynamo simulations.
publishDate 2015
dc.date.none.fl_str_mv 2015-02
2015-02-01T00:00:00Z
2018-12-07T14:53:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/11309
url http://hdl.handle.net/10400.1/11309
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2041-8205
10.1088/2041-8205/800/1/L18
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dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Iop Publishing Ltd
publisher.none.fl_str_mv Iop Publishing Ltd
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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