Dynamic magnetic reconnection at an X-type neutral point

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dc.contributor.authorCraig, Ian J.D.en_NZ
dc.contributor.authorMcClymont, A.N.en_NZ
dc.date.accessioned2016-05-04T23:11:57Z
dc.date.available1991en_NZ
dc.date.available2016-05-04T23:11:57Z
dc.date.issued1991en_NZ
dc.description.abstractThe relaxation of a two-dimensional "X-type" neutral point magnetic field disturbed from equilibrium is considered. Perturbations are shown to possess well-defined azimuthal modes which allow an exact determination of the magnetic annihilation rate. Free magnetic energy is dissipated by oscillatory reconnection which couples resistive diffusion at the neutral point to global advection of the outer field. The decay of azimuthally symmetric (m = 0) modes - the only modes associated with topological reconnection - is limited by the dissipation time scale of the "fundamental" (n = 0) mode with no radial nodes. This mode decays over typically 100 Alfvén times. An analytic treatment shows that the oscillation and decay time scales couple according to τosc ≈ 2 ln S and τdecay ≈ τosc 2/(2π2), where S is the Lundquist number (4π/c2)υA R/η and the times are in units of R/υA, with R the distance from the neutral point to the boundary, υA the Alfvén speed at the boundary, and η the resistivity.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.citationCraig, I. J. D., & McClymont, A. N. (1991). Dynamic magnetic reconnection at an X-type neutral point. The Astrophysical Journal, 371(1), L41–L44. http://doi.org/10.1086/185997en
dc.identifier.doi10.1086/185997en_NZ
dc.identifier.eissn1538-4357en_NZ
dc.identifier.issn0004-637Xen_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10173
dc.language.isoen
dc.relation.isPartOfThe Astrophysical Journalen_NZ
dc.rightsThis article is published in The Astrophysical Journal. ©1991 American Astronomical Society.
dc.titleDynamic magnetic reconnection at an X-type neutral pointen_NZ
dc.typeJournal Article
pubs.begin-pageL41
pubs.elements-id83861
pubs.end-pageL44
pubs.issue1en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FCMS
pubs.volume371en_NZ
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