Coupled spin models for magnetic variation of planets and stars

Geomagnetism is characterized by intermittent polarity reversals and rapid fluctuations. We have recently proposed a coupled macro-spin model to describe these dynamics based on the idea that the whole dynamo mechanism is described by the coherent interactions of many local elements. In this paper,...

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Detalles Bibliográficos
Autores: Nakamichi, A., Mouri, H., Schmitt, D., Ferriz Mas, Antonio, Wicht, J., Morikawa, M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/424209
Acceso en línea:http://hdl.handle.net/10261/424209
Access Level:acceso abierto
Palabra clave:Dynamo
MHD
Sun: dynamo
Planets and satellites: magnetic fields
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spelling Coupled spin models for magnetic variation of planets and starsNakamichi, A.Mouri, H.Schmitt, D.Ferriz Mas, AntonioWicht, J.Morikawa, M.DynamoMHDSun: dynamoPlanets and satellites: magnetic fieldsGeomagnetism is characterized by intermittent polarity reversals and rapid fluctuations. We have recently proposed a coupled macro-spin model to describe these dynamics based on the idea that the whole dynamo mechanism is described by the coherent interactions of many local elements. In this paper, we further develop this idea and construct the minimal model for magnetic variations. This simple model naturally yields many of the observed features of geomagnetism: its time evolution, the power spectrum, the frequency distribution of stable polarity periods etc. This model is characterized by two coexisting phases of spins: i.e. the cluster phase which determines the global dipole magnetic moment, and the expanded phase which gives random perpetual perturbations that yield the intermittent polarity flip of the dipole moment. This model can also describe the synchronization of the spin oscillations. This corresponds to the case of our Sun and the model well describes the quasi-regular cycles of the solar magnetism. Furthermore, by analysing the relevant terms of magnetohydrodynamic equations based on our model, we have obtained a scaling relation for the magnetism for planets, satellites and the Sun. Comparing it with various observations, we can estimate the relevant scale of the macro-spins. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.This work was supported by KAKENHI, Grant-in-Aid for Scien- tific Research (C21540287 and C23540291). The research of AFM has been partially funded by the Spanish Ministerio de Ciencia e Innovaci´on through projects AYA2009-14105-C06-06 and AYA2011-29833-C06-04 (including European FEDER funds).Peer reviewedOxford University PressJapanese GovernmentMinisterio de Ciencia e Innovación (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/424209reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//AYA2009-14105-C06-06info:eu-repo/grantAgreement/MICINN//AYA2011-29833-C06-04http://dx.doi.org/10.1111/j.1365-2966.2012.20862.xSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4242092026-05-22T06:33:51Z
dc.title.none.fl_str_mv Coupled spin models for magnetic variation of planets and stars
title Coupled spin models for magnetic variation of planets and stars
spellingShingle Coupled spin models for magnetic variation of planets and stars
Nakamichi, A.
Dynamo
MHD
Sun: dynamo
Planets and satellites: magnetic fields
title_short Coupled spin models for magnetic variation of planets and stars
title_full Coupled spin models for magnetic variation of planets and stars
title_fullStr Coupled spin models for magnetic variation of planets and stars
title_full_unstemmed Coupled spin models for magnetic variation of planets and stars
title_sort Coupled spin models for magnetic variation of planets and stars
dc.creator.none.fl_str_mv Nakamichi, A.
Mouri, H.
Schmitt, D.
Ferriz Mas, Antonio
Wicht, J.
Morikawa, M.
author Nakamichi, A.
author_facet Nakamichi, A.
Mouri, H.
Schmitt, D.
Ferriz Mas, Antonio
Wicht, J.
Morikawa, M.
author_role author
author2 Mouri, H.
Schmitt, D.
Ferriz Mas, Antonio
Wicht, J.
Morikawa, M.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Japanese Government
Ministerio de Ciencia e Innovación (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Dynamo
MHD
Sun: dynamo
Planets and satellites: magnetic fields
topic Dynamo
MHD
Sun: dynamo
Planets and satellites: magnetic fields
description Geomagnetism is characterized by intermittent polarity reversals and rapid fluctuations. We have recently proposed a coupled macro-spin model to describe these dynamics based on the idea that the whole dynamo mechanism is described by the coherent interactions of many local elements. In this paper, we further develop this idea and construct the minimal model for magnetic variations. This simple model naturally yields many of the observed features of geomagnetism: its time evolution, the power spectrum, the frequency distribution of stable polarity periods etc. This model is characterized by two coexisting phases of spins: i.e. the cluster phase which determines the global dipole magnetic moment, and the expanded phase which gives random perpetual perturbations that yield the intermittent polarity flip of the dipole moment. This model can also describe the synchronization of the spin oscillations. This corresponds to the case of our Sun and the model well describes the quasi-regular cycles of the solar magnetism. Furthermore, by analysing the relevant terms of magnetohydrodynamic equations based on our model, we have obtained a scaling relation for the magnetism for planets, satellites and the Sun. Comparing it with various observations, we can estimate the relevant scale of the macro-spins. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
publishDate 2012
dc.date.none.fl_str_mv 2012
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/424209
url http://hdl.handle.net/10261/424209
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICINN//AYA2009-14105-C06-06
info:eu-repo/grantAgreement/MICINN//AYA2011-29833-C06-04
http://dx.doi.org/10.1111/j.1365-2966.2012.20862.x
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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