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dc.contributor.authorDmitruk, Pablo
dc.contributor.authorMatthaeus, William H.
dc.contributor.authorOughton, Sean
dc.date.accessioned2008-11-04T01:57:33Z
dc.date.available2008-11-04T01:57:33Z
dc.date.issued2005-07-15
dc.identifier.citationDmitruk, P., Matthaeus, W. & Oughton, S. (2005). Current singularities at finitely compressible three-dimensional magnetic null points. Physics of Plasmas, 12, 112304 .en_US
dc.identifier.issn1070-664X
dc.identifier.urihttps://hdl.handle.net/10289/1265
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_US
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherAmerican Institute of Physicsen_NZ
dc.relation.urihttp://link.aip.org/link/?PHPAEN/12/072112/1en_US
dc.rightsCopyright 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. The following article appeared in the journal Physics of Plasmas and may be found at http://jmp.aip.org/jmp/top.jspen_US
dc.subjectmathematicsen_US
dc.subjectplasma transport processesen_US
dc.subjectplasma magnetohydrodynamicsen_US
dc.subjectplasma pressureen_US
dc.titleCurrent singularities at finitely compressible three-dimensional magnetic null pointsen_US
dc.typeJournal Articleen_US
dc.identifier.doi10.1063/1.1987379en_US
dc.relation.isPartOfPhysics of Plasmasen_NZ
pubs.begin-page1en_NZ
pubs.elements-id31936
pubs.end-page8en_NZ
pubs.issue7en_NZ
pubs.volume12en_NZ


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