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dc.contributor.author
Santos Lima, R.
dc.contributor.author
Pino, E. M. de Gouveia Dal
dc.contributor.author
Kowal, G.
dc.contributor.author
Falceta Gonçalves, D.
dc.contributor.author
Lazarian, A.
dc.contributor.author
Nakwacki, Maria Soledad
dc.date.available
2017-06-06T15:20:07Z
dc.date.issued
2014-02
dc.identifier.citation
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
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/17565
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Iop Publishing
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Turbulence
dc.subject
Magnetohydrodynamics
dc.subject
Collisionless
dc.subject
Intracluster
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Magnetic Field Amplification and Evolution in Turbulent Collisionless Magnetohydrodynamics: An Application to the Intracluster Medium
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-01T16:45:33Z
dc.journal.volume
781
dc.journal.number
84
dc.journal.pagination
1-21
dc.journal.pais
Reino Unido
dc.journal.ciudad
Chicago
dc.description.fil
Fil: Santos Lima, R.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
dc.description.fil
Fil: Pino, E. M. de Gouveia Dal. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
dc.description.fil
Fil: Kowal, G.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
dc.description.fil
Fil: Falceta Gonçalves, D.. Universidade Do Sao Paulo. Instituto Astronomia, Geofisica E Ciencias Atmosfericas; Brasil
dc.description.fil
Fil: Lazarian, A.. University of Wisconsin; Estados Unidos
dc.description.fil
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
dc.journal.title
Astrophysical Journal
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/781/2/84/meta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1088/0004-637X/781/2/84


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