Simulations of 3D Magnetic Merging: Resistive Scalings for Null Point and QSL Reconnection

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dc.contributor.authorEffenberger, Fredericen_NZ
dc.contributor.authorCraig, Ian J.D.en_NZ
dc.date.accessioned2018-05-24T03:59:21Z
dc.date.available2016-01-01en_NZ
dc.date.available2018-05-24T03:59:21Z
dc.date.issued2016en_NZ
dc.description.abstractStarting from an exact, steady-state, force-free solution of the magnetohydrodynamic (MHD) equations, we investigate how resistive current layers are induced by perturbing line-tied three-dimensional magnetic equilibria. This is achieved by the superposition of a weak perturbation field in the domain, in contrast to studies where the boundary is driven by slow motions, like those present in photospheric active regions. Our aim is to quantify how the current structures are altered by the contribution of so-called quasi-separatrix layers (QSLs) as the null point is shifted outside the computational domain. Previous studies based on magneto-frictional relaxation have indicated that despite the severe field line gradients of the QSL, the presence of a null is vital in maintaining fast reconnection. Here, we explore this notion using highly resolved simulations of the full MHD evolution. We show that for the null-point configuration, the resistive scaling of the peak current density is close to J∼η−¹, while the scaling is much weaker, i.e. J∼η⁻⁰.⁴, when only the QSL connectivity gradients provide a site for the current accumulation.
dc.format.mimetypeapplication/pdf
dc.identifier.citationEffenberger, F., & Craig, I. J. D. (2016). Simulations of 3D Magnetic Merging: Resistive Scalings for Null Point and QSL Reconnection. Solar Physics, 291(1), 143–153. https://doi.org/10.1007/s11207-015-0825-6en
dc.identifier.doi10.1007/s11207-015-0825-6en_NZ
dc.identifier.eissn1573-093Xen_NZ
dc.identifier.issn0038-0938en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11863
dc.language.isoenen_NZ
dc.publisherSpringeren_NZ
dc.relation.isPartOfSolar Physicsen_NZ
dc.rights© 2017 Springer Netherlands. This is the author's accepted version. The final publication is available at Springer via dx.doi.org/10.1007/s11207-015-0825-6
dc.subjectScience & Technologyen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectAstronomy & Astrophysicsen_NZ
dc.subjectMagnetic reconnectionen_NZ
dc.subjectElectric currents and current sheetsen_NZ
dc.subjectFlaresen_NZ
dc.subjectMagnetic fields, coronaen_NZ
dc.subjectMagnetic fields, modelsen_NZ
dc.subjectQUASI-SEPARATRIX LAYERSen_NZ
dc.subjectCURRENT SINGULARITIESen_NZ
dc.subjectCURRENT SHEETSen_NZ
dc.subjectNEUTRAL POINTen_NZ
dc.subjectFIELDSen_NZ
dc.subjectPLUTOen_NZ
dc.subjectSPINEen_NZ
dc.subjectCODEen_NZ
dc.subjectFANen_NZ
dc.subjectMagnetic reconnection
dc.subjectElectric currents and current sheets
dc.subjectFlares
dc.subjectMagnetic fields, corona
dc.subjectMagnetic fields, models
dc.titleSimulations of 3D Magnetic Merging: Resistive Scalings for Null Point and QSL Reconnectionen_NZ
dc.typeJournal Article
pubs.begin-page143
pubs.elements-id135984
pubs.end-page153
pubs.issue1en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FCMS
pubs.organisational-group/Waikato/FCMS/Mathematics and Statistics
pubs.publication-statusPublisheden_NZ
pubs.volume291en_NZ
uow.verification.statusverified
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