{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1362825894240692736.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/90ja01762"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F90JA01762"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/90JA01762"}}],"dc:title":[{"@value":"The substorm current wedge and field‐aligned currents in MHD simulations of magnetotail reconnection"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>We present results of a three‐dimensional MHD simulation of magnetotail reconnection, which, in contrast to earlier ones, starts from an equilibrium configuration that contains a region 1 type field‐aligned current system at the plasma sheet/lobe boundary. This current system is found from equilibrium theory as the consequence of boundary conditions, which require that field lines at large distances from the Earth become aligned with the tail axis, consistent with observations and the expected consequences of the interaction with the solar wind. As in earlier simulations, the dynamic evolution develops from a slow diffusion to the fast growth of a three‐dimensional tearing mode, initiated by the sudden occurrence or increase of resistivity, leading again to the formation and subsequent tailward ejection of a plasmoid, associated with fast plasma flows. In addition, we find changes of the electric current system which are consistent with the substorm current wedge picture inferred from observations, i.e., a deviation of cross‐tail current from a near‐Earth tail region toward the Earth on the dawn side and away on the dusk side, associated with field‐aligned currents of the same signature. While the total cross‐tail current is reduced at the location of the near‐Earth reconnection site, the local current density at the near‐Earth X line actually increases, consistent with the strong plasma sheet thinning in that region. The source regions of the field‐aligned currents, indicated by strong peaks of ▽·j<jats:sub>∥</jats:sub>, are identified as regions of strong plasma flow vorticity near the boundaries of the fast earthward flow earthward of the reconnection site. This flow shear increases preexisting magnetic shear resulting in an increased twist of magnetic flux tubes connected with these regions and thus a generation or increase of the field‐aligned currents. We note that the current diversion in our simulation is not caused by a locally enhanced resistivity (although in reality this might be the case) but by the localization of reconnection in a three‐dimensional tail configuration.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380009142594231941","@type":"Researcher","foaf:name":[{"@value":"J. Birn"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894240692737","@type":"Researcher","foaf:name":[{"@value":"M. Hesse"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1991-02","prism:volume":"96","prism:number":"A2","prism:startingPage":"1611","prism:endingPage":"1618"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F90JA01762"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/90JA01762"}],"createdAt":"2008-02-06","modifiedAt":"2023-09-22","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050564288163925760","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Simulation study of near-Earth space disturbances: 2. Auroral substorms"}]},{"@id":"https://cir.nii.ac.jp/crid/1050564288163926784","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Energy flow exciting field-aligned current at substorm expansion onset"},{"@value":"Energy Flow Exciting Field‐Aligned Current at Substorm Expansion Onset"}]},{"@id":"https://cir.nii.ac.jp/crid/1050572512051726464","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Evolution of auroral substorm as viewed from MHD simulations: dynamics, energy transfer and energy conversion"}]},{"@id":"https://cir.nii.ac.jp/crid/1050859073008347136","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Generation of Field-Aligned Currents During Substorm Expansion: An Update"},{"@value":"Generation of Field‐Aligned Currents During Substorm Expansion: An Update"}]},{"@id":"https://cir.nii.ac.jp/crid/1050865265017810816","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Generation mechanism of Region 1 field-aligned current and energy transfer from solar wind to polar ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360009142594231552","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Quiescent Discrete Auroral Arcs: A Review of Magnetospheric Generator Mechanisms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360576118693170048","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Dawn‐Dusk Confinement of Magnetic Reconnection Site in the Near‐Earth Magnetotail and Its Implication for Dipolarization and Substorm Current System"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/90ja01762"},{"@type":"CROSSREF","@value":"10.1007/s11214-019-0619-5_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"},{"@type":"CROSSREF","@value":"10.1007/s41614-024-00154-7_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"},{"@type":"CROSSREF","@value":"10.1029/2022ja031011_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"},{"@type":"CROSSREF","@value":"10.1186/s40645-019-0273-2_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"},{"@type":"CROSSREF","@value":"10.1029/2021ja029691_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"},{"@type":"CROSSREF","@value":"10.1002/2017ja024294_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"},{"@type":"CROSSREF","@value":"10.1007/s41614-019-0037-x_references_DOI_Eq7UBmOIsrvlUGv7JXgk8gtJxQX"}]}