{"@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/1361137044020520960.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2008gl036574"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2008GL036574"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2008GL036574"}}],"dc:title":[{"@value":"Substorm onset timing via traveltime magnetoseismology"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>This letter introduces a traveltime magnetoseismic technique that can estimate the substorm onset time in the magnetotail from multi‐point observations of Pi 2 pulsations. The arrival time of Pi 2, which is defined as the first peak in Pi 2 amplitude, observed by ground magnetometers presents a strong function of latitude. Using the Tamao traveltime as the forward model, the magnetoseismic inversion from the observed Pi 2 arrival time infers that the onset of the 22 July 1998 substorm in the magnetotail started at X ∼ −20 R<jats:sub>E</jats:sub> at 6:53:10 UT, or 1–3 minutes earlier than the Pi 2 onset time conventionally identified in ground records. The magnetoseismic result is further compared with the observations of auroral brightening, revealing a clear sequence of events during this substorm.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380848661782594954","@type":"Researcher","foaf:name":[{"@value":"P. J. Chi"}],"jpcoar:affiliationName":[{"@value":"Institute of Geophysics and Planetary Physics University of California  Los Angeles California USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137044020520961","@type":"Researcher","foaf:name":[{"@value":"C. T. Russell"}],"jpcoar:affiliationName":[{"@value":"Institute of Geophysics and Planetary Physics University of California  Los Angeles California USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137044020520960","@type":"Researcher","foaf:name":[{"@value":"S. Ohtani"}],"jpcoar:affiliationName":[{"@value":"Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00948276"},{"@type":"EISSN","@value":"19448007"}],"prism:publicationName":[{"@value":"Geophysical Research Letters"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2009-04","prism:volume":"36","prism:number":"8"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2008GL036574"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2008GL036574"}],"createdAt":"2009-04-27","modifiedAt":"2023-10-31","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360846646045128704","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848654734286336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Initial deflection of middle‐latitude Pi2 pulsations in the premidnight sector: Remote detection of oscillatory upward field‐aligned current at substorm onset"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848654738328960","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Application of a global magnetospheric‐ionospheric current model for dayside and terminator Pi2 pulsations"}]},{"@id":"https://cir.nii.ac.jp/crid/2051714791863302528","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Solar terminator effects on middle- to low-latitude Pi2 pulsations"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2008gl036574"},{"@type":"CROSSREF","@value":"10.5194/angeo-29-1663-2011_references_DOI_Y1na9qMSWrwmbXzCq24aB3mwTGe"},{"@type":"CROSSREF","@value":"10.1002/2015ja021698_references_DOI_Y1na9qMSWrwmbXzCq24aB3mwTGe"},{"@type":"CROSSREF","@value":"10.1002/2017ja024246_references_DOI_Y1na9qMSWrwmbXzCq24aB3mwTGe"},{"@type":"CROSSREF","@value":"10.1186/s40623-016-0514-1_references_DOI_Y1na9qMSWrwmbXzCq24aB3mwTGe"}]}