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dc.contributor.authorPontin, D.I.en_NZ
dc.contributor.authorCraig, Ian J.D.en_NZ
dc.date.accessioned2015-06-08T23:25:06Z
dc.date.available2005en_NZ
dc.date.available2015-06-08T23:25:06Z
dc.date.issued2005en_NZ
dc.identifier.citationPontin, D. I., & Craig, I. J. D. (2005). Current singularities at finitely compressible three-dimensional magnetic null points. Physics of Plasmas, 12(7), 1–8. http://doi.org/10.1063/1.1987379en
dc.identifier.issn1070-664Xen_NZ
dc.identifier.urihttps://hdl.handle.net/10289/9357
dc.description.abstractThe formation of current singularities at line-tied two- and three-dimensional (2D and 3D, respectively) magnetic null points in a nonresistive magnetohydrodynamic environment is explored. It is shown that, despite the different separatrix structures of 2D and 3D null points, current singularities may be initiated in a formally equivalent manner. This is true no matter whether the collapse is triggered by flux imbalance within closed, line-tied null points or driven by externally imposed velocity fields in open, incompressible geometries. A Lagrangian numerical code is used to investigate the finite amplitude perturbations that lead to singular current sheets in collapsing 2D and 3D null points. The form of the singular current distribution is analyzed as a function of the spatial anisotropy of the null point, and the effects of finite gas pressure are quantified. It is pointed out that the pressure force, while never stopping the formation of the singularity, significantly alters the morphology of the current distribution as well as dramatically weakening its strength. The impact of these findings on 2D and 3D magnetic reconnection models is discussed.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoengen_NZ
dc.rights© 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
dc.titleCurrent singularities at finitely compressible three-dimensional magnetic null pointsen_NZ
dc.typeJournal Article
dc.identifier.doi10.1063/1.1987379en_NZ
dc.relation.isPartOfPhysics of Plasmasen_NZ
pubs.begin-page1
pubs.declined2015-06-09T11:05:04.178+1200
pubs.deleted2015-06-09T11:05:04.178+1200
pubs.end-page8
pubs.issue7en_NZ
pubs.volume12en_NZ


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