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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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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)