Current singularities in line-tied three-dimensional magnetic fields

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dc.contributor.authorCraig, Ian J.D.en_NZ
dc.contributor.authorPontin, D.I.en_NZ
dc.date.accessioned2015-06-08T23:05:15Z
dc.date.available2014-06-20en_NZ
dc.date.available2015-06-08T23:05:15Z
dc.date.issued2014-06-20en_NZ
dc.description.abstractThis paper considers the current distributions that derive from finite amplitude perturbations of line-tied magnetic fields comprising hyperbolic field structures. The initial equilibrium on which we principally focus is a planar magnetic X-point threaded by a uniform axial field. This field is line-tied on all surfaces but subject to threedimensional (3D) disturbances that alter the initial topology. Results of ideal relaxation simulations are presented which illustrate how intense current structures form that can be related, through the influence of line-tying, to the quasi-separatrix layers (QSLs) of the initial configuration. It is demonstrated that the location within the QSL that attracts the current, and its scaling properties, are strongly dependent on the relative dimensions of the QSL with respect to the line-tied boundaries. These results are contrasted with the behavior of a line-tied 3D field containing an isolated null point. In this case, it is found that the dominant current always forms at the null, but that the collapse is inhibited when the null is closer to a line-tied boundary.
dc.format.mimetypeapplication/pdf
dc.identifier.citationCraig, I. J. D., & Pontin, D. I. (2014). Current singularities in line-tied three-dimensional magnetic fields. Astrophysical Journal, 788(2), article no. 177. http://doi.org/10.1088/0004-637X/788/2/177en
dc.identifier.doi10.1088/0004-637X/788/2/177en_NZ
dc.identifier.issn0004-637Xen_NZ
dc.identifier.urihttps://hdl.handle.net/10289/9356
dc.language.isoenen_NZ
dc.publisherIOP PUBLISHING LTDen_NZ
dc.relation.isPartOfAstrophysical Journalen_NZ
dc.rights© 2014 The American Astronomical Society.
dc.subjectScience & Technologyen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectAstronomy & Astrophysicsen_NZ
dc.subjectmagnetic fieldsen_NZ
dc.subjectmagnetic reconnectionen_NZ
dc.subjectmagnetohydrodynamics (MHD)en_NZ
dc.subjectSun: coronaen_NZ
dc.subjectHYPERBOLIC FLUX TUBESen_NZ
dc.subjectQUASI-SEPARATRIX LAYERSen_NZ
dc.subjectnull pointsen_NZ
dc.subjectreconnectionen_NZ
dc.titleCurrent singularities in line-tied three-dimensional magnetic fieldsen_NZ
dc.typeJournal Article
pubs.begin-page177en_NZ
pubs.elements-id83270
pubs.end-page177en_NZ
pubs.issue2en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FCMS
pubs.organisational-group/Waikato/FCMS/Mathematics
pubs.publication-statusPublisheden_NZ
pubs.volume788en_NZ
uow.identifier.article-noARTN 177
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