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dc.creatorHoyos J.H.spa
dc.creatorReisenegger A.spa
dc.creatorValdivia J.A.spa
dc.date.accessioned2015-10-09T13:17:52Z
dc.date.available2015-10-09T13:17:52Z
dc.date.created2010
dc.identifier.urihttp://hdl.handle.net/11407/1366
dc.description.abstractWe study the effect of the non-linear process of ambipolar diffusion (joint transport of magnetic flux and charged particles relative to neutral particles) on the long-term behaviour of a non-uniform magnetic field in a one-dimensional geometry. Our main focus is the dissipation of magnetic energy inside neutron stars (particularly magnetars), but our results have a wider application, particularly to the interstellar medium and the loss of magnetic flux from collapsing molecular cloud cores. Our system is a weakly ionized plasma in which neutral and charged particles can be converted into each other through nuclear beta decays (or ionization-recombination processes). In the ‘weak-coupling’ limit of infrequent inter-particle interactions, the evolution of the magnetic field is controlled by the beta decay rate and can be described by a non-linear partial integro-differential equation. In the opposite, ‘strong-coupling’ regime, the evolution is controlled by the inter-particle collisions and can be modelled through a non-linear diffusion equation. We show numerically that, in both regimes, ambipolar diffusion tends to spread out the magnetic flux, but, contrary to the normal Ohmic diffusion, it produces sharp magnetic-field gradients with associated current sheets around those regions where the magnetic field is weak.eng
dc.language.isoeng
dc.relation.isversionofhttp://mnras.oxfordjournals.org/content/408/3/1730.shortspa
dc.sourceScopusspa
dc.titleAsymptotic, non-linear solutions for ambipolar diffusion in one dimensioneng
dc.typeArticleeng
dc.rights.accessrightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.accessrightsinfo:eu-repo/semantics/restrictedAccess
dc.contributor.affiliationDepartamento de Ciencias Básicas, Universidad de Medellín, Cra 87 No 30-65, Medellín, Colombiaspa
dc.contributor.affiliationDepartamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chilespa
dc.contributor.affiliationAstrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germanyspa
dc.contributor.affiliationDepartamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chilespa
dc.identifier.doi10.1111/j.1365-2966.2010.17237.x
dc.subject.keywordWe study the effect of the non-linear process of ambipolar diffusion (joint transport of magnetic flux and charged particles relative to neutral particles) on the long-term behaviour of a non-uniform magnetic field in a one-dimensional geometry. Our main focus is the dissipation of magnetic energy inside neutron stars (particularly magnetars), but our results have a wider application, particularly to the interstellar medium and the loss of magnetic flux from collapsing molecular cloud cores. Our system is a weakly ionized plasma in which neutral and charged particles can be converted into each other through nuclear beta decays (or ionization-recombination processes). In the 'weak-coupling' limit of infrequent inter-particle interactions, the evolution of the magnetic field is controlled by the beta decay rate and can be described by a non-linear partial integro-differential equation. In the opposite, 'strong-coupling' regime, the evolution is controlled by the inter-particle collisions and can be modelled through a non-linear diffusion equation. We show numerically that, in both regimes, ambipolar diffusion tends to spread out the magnetic flux, but, contrary to the normal Ohmic diffusion, it produces sharp magnetic-field gradients with associated current sheets around those regions where the magnetic field is weak. © 2010 The Authors. Journal compilation © 2010 RAS.eng
dc.relation.ispartofenMonthly Notices of the Royal Astronomical Society, noviembre de 2010, volume 408, issue 3, pp 1730-1741eng
dc.title.englishAsymptotic, non-linear solutions for ambipolar diffusion in one dimensioneng
dc.type.driverinfo:eu-repo/semantics/article


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