{"@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/1362544420209942016.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.5194/angeo-25-437-2007"}},{"identifier":{"@type":"URI","@value":"https://angeo.copernicus.org/articles/25/437/2007/angeo-25-437-2007.pdf"}}],"dc:title":[{"@value":"Role of inductive electric fields and currents in dynamical ionospheric situations"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Abstract. We study the role of ionospheric induction in different commonly observed ionospheric situations. These include an intensifying electrojet, westward travelling surge (WTS) and Ω-band. We use data based, realistic models for these phenomena and calculate the inductive electric fields that are created due to the temporal variations of ionospheric currents. The ionospheric induction problem is solved using a new calculation technique that can handle non-uniform, time-dependent conductances and electric fields of any geometry. We find that in some situations inductive effects are not negligible and the ionospheric electric field is not a pure potential field, but has a significant induced rotational part. In the WTS and Ω-band models the induced electric field is concentrated in a small area, where the time derivatives are largest. In the electrojet model the induced field is significant over a large part of the jet area. In these examples the induced electric field has typical values of few mV/m, which amounts to several tens of percents of the potential electric field present at the same locations. The induced electric field is associated with ionospheric and field aligned currents (FAC), that modify the overall structure of the current systems. Especially the induced FAC are often comparable to the non-inductive FAC, and may thus modify the coupling between the ionosphere and magnetosphere in the most dynamical situations. We also present some examples with very simple ionospheric current systems, where the effect of different ionospheric parameters on the induction process is studied.\n                    </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380567007856358407","@type":"Researcher","foaf:name":[{"@value":"H. Vanhamäki"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544420209942017","@type":"Researcher","foaf:name":[{"@value":"O. Amm"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544420209942016","@type":"Researcher","foaf:name":[{"@value":"A. Viljanen"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"14320576"}],"prism:publicationName":[{"@value":"Annales Geophysicae"}],"dc:publisher":[{"@value":"Copernicus GmbH"}],"prism:publicationDate":"2007-03-08","prism:volume":"25","prism:number":"2","prism:startingPage":"437","prism:endingPage":"455"},"reviewed":"false","dc:rights":["https://creativecommons.org/licenses/by/3.0/"],"url":[{"@id":"https://angeo.copernicus.org/articles/25/437/2007/angeo-25-437-2007.pdf"}],"createdAt":"2010-06-15","modifiedAt":"2021-01-28","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360285708265132416","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"A self-consistent synthesis description of magnetosphere-ionosphere coupling and scale-dependent auroral process using shear Alfvén wave"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848655105299328","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Theory of Cowling channel formation by reflection of shear Alfven waves from the auroral ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848658218547328","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Self-consistent formulation for the evolution of ionospheric conductances at the ionospheric<i>E</i>region within the M-I coupling scheme"}]},{"@id":"https://cir.nii.ac.jp/crid/2050307417166183168","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The science case for the EISCAT_3D radar"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.5194/angeo-25-437-2007"},{"@type":"CROSSREF","@value":"10.1186/s40645-015-0051-8_references_DOI_38A5XvV08geCEliqQtr2cyXOGh9"},{"@type":"CROSSREF","@value":"10.1029/2011ja016460_references_DOI_38A5XvV08geCEliqQtr2cyXOGh9"},{"@type":"CROSSREF","@value":"10.1002/jgra.50514_references_DOI_38A5XvV08geCEliqQtr2cyXOGh9"},{"@type":"CROSSREF","@value":"10.1029/2011ja016449_references_DOI_38A5XvV08geCEliqQtr2cyXOGh9"}]}