Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium

Autores
Santos Lima, R.; Pino, E. M. de Gouveia Dal; Kowal, G.; Falceta Gonçalves, D.; Lazarian, A.; Nakwacki, Maria Soledad
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The amplification of magnetic fields (MFs) in the intracluster medium (ICM) is attributed to turbulent dynamo (TD) action, which is generally derived in the collisional-MHD framework. However, this assumption is poorly justified a priori, since in the ICM the ion mean free path between collisions is of the order of the dynamical scales, thus requiring a collisionless MHD description. The present study uses an anisotropic plasma pressure that brings the plasma within a parametric space where collisionless instabilities take place. In this model, a relaxation term of the pressure anisotropy simulates the feedback of the mirror and firehose instabilities, in consistency with empirical studies. Our three-dimensional numerical simulations of forced transonic turbulence, aiming the modeling of the turbulent ICM, were performed for different initial values of the MF intensity and different relaxation rates of the pressure anisotropy. We found that in the high-β plasma regime corresponding to the ICM conditions, a fast anisotropy relaxation rate gives results that are similar to the collisional-MHD model, as far as the statistical properties of the turbulence are concerned. Also, the TD amplification of seed MFs was found to be similar to the collisional-MHD model. The simulations that do not employ the anisotropy relaxation deviate significantly from the collisional-MHD results and show more power at the small-scale fluctuations of both density and velocity as a result of the action of the instabilities. For these simulations, the large-scale fluctuations in the MF are mostly suppressed and the TD fails in amplifying seed MFs.
Fil: Santos Lima, R.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Pino, E. M. de Gouveia Dal. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Kowal, G.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Falceta Gonçalves, D.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Lazarian, A.. University of Wisconsin; Estados Unidos
Fil: Nakwacki, Maria Soledad. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Materia
Turbulence
Magnetohydrodynamics
Collisionless
Intracluster
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/17565
Acceder
id CONICETDig_0cbcb5241ca50b774943d58feca3cffc
oai_identifier_str oai:ri.conicet.gov.ar:11336/17565
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster MediumSantos Lima, R.Pino, E. M. de Gouveia DalKowal, G.Falceta Gonçalves, D.Lazarian, A.Nakwacki, Maria SoledadTurbulenceMagnetohydrodynamicsCollisionlessIntraclusterhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The amplification of magnetic fields (MFs) in the intracluster medium (ICM) is attributed to turbulent dynamo (TD) action, which is generally derived in the collisional-MHD framework. However, this assumption is poorly justified a priori, since in the ICM the ion mean free path between collisions is of the order of the dynamical scales, thus requiring a collisionless MHD description. The present study uses an anisotropic plasma pressure that brings the plasma within a parametric space where collisionless instabilities take place. In this model, a relaxation term of the pressure anisotropy simulates the feedback of the mirror and firehose instabilities, in consistency with empirical studies. Our three-dimensional numerical simulations of forced transonic turbulence, aiming the modeling of the turbulent ICM, were performed for different initial values of the MF intensity and different relaxation rates of the pressure anisotropy. We found that in the high-β plasma regime corresponding to the ICM conditions, a fast anisotropy relaxation rate gives results that are similar to the collisional-MHD model, as far as the statistical properties of the turbulence are concerned. Also, the TD amplification of seed MFs was found to be similar to the collisional-MHD model. The simulations that do not employ the anisotropy relaxation deviate significantly from the collisional-MHD results and show more power at the small-scale fluctuations of both density and velocity as a result of the action of the instabilities. For these simulations, the large-scale fluctuations in the MF are mostly suppressed and the TD fails in amplifying seed MFs.Fil: Santos Lima, R.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; BrasilFil: Pino, E. M. de Gouveia Dal. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; BrasilFil: Kowal, G.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; BrasilFil: Falceta Gonçalves, D.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; BrasilFil: Lazarian, A.. University of Wisconsin; Estados UnidosFil: Nakwacki, Maria Soledad. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaIop Publishing2014-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/17565Santos Lima, R.; Pino, E. M. de Gouveia Dal; Kowal, G.; Falceta Gonçalves, D.; Lazarian, A.; et al.; Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium; Iop Publishing; Astrophysical Journal; 781; 84; 2-2014; 1-210004-637Xenginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/781/2/84/metainfo:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1088/0004-637X/781/2/84info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:40:08Zoai:ri.conicet.gov.ar:11336/17565instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:40:08.356CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
title Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
spellingShingle Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
Santos Lima, R.
Turbulence
Magnetohydrodynamics
Collisionless
Intracluster
title_short Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
title_full Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
title_fullStr Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
title_full_unstemmed Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
title_sort Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
dc.creator.none.fl_str_mv Santos Lima, R.
Pino, E. M. de Gouveia Dal
Kowal, G.
Falceta Gonçalves, D.
Lazarian, A.
Nakwacki, Maria Soledad
author Santos Lima, R.
author_facet Santos Lima, R.
Pino, E. M. de Gouveia Dal
Kowal, G.
Falceta Gonçalves, D.
Lazarian, A.
Nakwacki, Maria Soledad
author_role author
author2 Pino, E. M. de Gouveia Dal
Kowal, G.
Falceta Gonçalves, D.
Lazarian, A.
Nakwacki, Maria Soledad
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Turbulence
Magnetohydrodynamics
Collisionless
Intracluster
topic Turbulence
Magnetohydrodynamics
Collisionless
Intracluster
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The amplification of magnetic fields (MFs) in the intracluster medium (ICM) is attributed to turbulent dynamo (TD) action, which is generally derived in the collisional-MHD framework. However, this assumption is poorly justified a priori, since in the ICM the ion mean free path between collisions is of the order of the dynamical scales, thus requiring a collisionless MHD description. The present study uses an anisotropic plasma pressure that brings the plasma within a parametric space where collisionless instabilities take place. In this model, a relaxation term of the pressure anisotropy simulates the feedback of the mirror and firehose instabilities, in consistency with empirical studies. Our three-dimensional numerical simulations of forced transonic turbulence, aiming the modeling of the turbulent ICM, were performed for different initial values of the MF intensity and different relaxation rates of the pressure anisotropy. We found that in the high-β plasma regime corresponding to the ICM conditions, a fast anisotropy relaxation rate gives results that are similar to the collisional-MHD model, as far as the statistical properties of the turbulence are concerned. Also, the TD amplification of seed MFs was found to be similar to the collisional-MHD model. The simulations that do not employ the anisotropy relaxation deviate significantly from the collisional-MHD results and show more power at the small-scale fluctuations of both density and velocity as a result of the action of the instabilities. For these simulations, the large-scale fluctuations in the MF are mostly suppressed and the TD fails in amplifying seed MFs.
Fil: Santos Lima, R.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Pino, E. M. de Gouveia Dal. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Kowal, G.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Falceta Gonçalves, D.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
Fil: Lazarian, A.. University of Wisconsin; Estados Unidos
Fil: Nakwacki, Maria Soledad. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
description The amplification of magnetic fields (MFs) in the intracluster medium (ICM) is attributed to turbulent dynamo (TD) action, which is generally derived in the collisional-MHD framework. However, this assumption is poorly justified a priori, since in the ICM the ion mean free path between collisions is of the order of the dynamical scales, thus requiring a collisionless MHD description. The present study uses an anisotropic plasma pressure that brings the plasma within a parametric space where collisionless instabilities take place. In this model, a relaxation term of the pressure anisotropy simulates the feedback of the mirror and firehose instabilities, in consistency with empirical studies. Our three-dimensional numerical simulations of forced transonic turbulence, aiming the modeling of the turbulent ICM, were performed for different initial values of the MF intensity and different relaxation rates of the pressure anisotropy. We found that in the high-β plasma regime corresponding to the ICM conditions, a fast anisotropy relaxation rate gives results that are similar to the collisional-MHD model, as far as the statistical properties of the turbulence are concerned. Also, the TD amplification of seed MFs was found to be similar to the collisional-MHD model. The simulations that do not employ the anisotropy relaxation deviate significantly from the collisional-MHD results and show more power at the small-scale fluctuations of both density and velocity as a result of the action of the instabilities. For these simulations, the large-scale fluctuations in the MF are mostly suppressed and the TD fails in amplifying seed MFs.
publishDate 2014
dc.date.none.fl_str_mv 2014-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/17565
Santos Lima, R.; Pino, E. M. de Gouveia Dal; Kowal, G.; Falceta Gonçalves, D.; Lazarian, A.; et al.; Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium; Iop Publishing; Astrophysical Journal; 781; 84; 2-2014; 1-21
0004-637X
url http://hdl.handle.net/11336/17565
identifier_str_mv Santos Lima, R.; Pino, E. M. de Gouveia Dal; Kowal, G.; Falceta Gonçalves, D.; Lazarian, A.; et al.; Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium; Iop Publishing; Astrophysical Journal; 781; 84; 2-2014; 1-21
0004-637X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/781/2/84/meta
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1088/0004-637X/781/2/84
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Iop Publishing
publisher.none.fl_str_mv Iop Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844613269653815296
score 13.070432

Publicaciones similares