{"@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/1363951794008790656.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2007ja012524"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2007JA012524"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2007JA012524"}}],"dc:title":[{"@value":"Spatio‐temporal characterization of the equatorial electrojet from CHAMP, Ørsted, and SAC‐C satellite magnetic measurements"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>The equatorial electrojet (EEJ) is an eastward electric current on the day‐side, flowing in a narrow band along the dip equator in the ionospheric <jats:italic>E</jats:italic> region. Recent magnetic observations from the CHAMP, Ørsted, and SAC‐C satellites, comprising more than 95,000 dip equator crossings from 1999 to 2006, have provided an unprecedented longitudinal coverage of the EEJ magnetic signature. We have used these data to construct an empirical model of the EEJ current climatological mean and day to day variability as a function of longitude, local time, season, and solar flux. Our model has been successfully verified against vertical drift data from the JULIA radar at Jicamarca. We have also used the EEJ observations to estimate the self‐correlation of the EEJ, confirming short longitudinal correlation lengths of 15° and finding a temporal correlation length of 2.4 h. Our model's predictions of the eastward electric field and its standard deviation may provide useful input to various kinds of ionospheric simulations. Coefficients and software are available online at http://models.geomag.us/EEJ.html and http://www.earthref.org.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383951794008790656","@type":"Researcher","foaf:name":[{"@value":"Patrick Alken"}],"jpcoar:affiliationName":[{"@value":"Department of Physics University of Colorado  Boulder Colorado USA"},{"@value":"Cooperative Institute for Research in Environmental Sciences University of Colorado  Boulder Colorado USA"},{"@value":"National Geophysical Data Center NOAA  Boulder Colorado USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1383951794008790657","@type":"Researcher","foaf:name":[{"@value":"Stefan Maus"}],"jpcoar:affiliationName":[{"@value":"Cooperative Institute for Research in Environmental Sciences University of Colorado  Boulder Colorado USA"},{"@value":"National Geophysical Data Center NOAA  Boulder Colorado USA"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2007-09","prism:volume":"112","prism:number":"A9","prism:startingPage":"A09305"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2007JA012524"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2007JA012524"}],"createdAt":"2007-09-12","modifiedAt":"2023-10-31","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360021389801897600","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Using Principal Component Analysis of Satellite and Ground Magnetic Data to Model the Equatorial Electrojet and Derive Its Tidal Composition"}]},{"@id":"https://cir.nii.ac.jp/crid/1360298754825669376","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Empirical Modeling of Ionospheric Current Using Empirical Orthogonal Function Analysis and Artificial Neural Network"}]},{"@id":"https://cir.nii.ac.jp/crid/1360565167415820544","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Peak time of equatorial electrojet from different longitude sectors during fall solar minimum"}]},{"@id":"https://cir.nii.ac.jp/crid/1360565167939536640","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Longitudinal and solar activity dependence of equatorial electrojet at Southeast Asian sector"}]},{"@id":"https://cir.nii.ac.jp/crid/1360584339765080448","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Ionospheric Current Variations by Empirical Orthogonal Function Analysis: Solar Activity Dependence and Longitudinal Differences"}]},{"@id":"https://cir.nii.ac.jp/crid/2051714792052378240","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Empirical model of equatorial electrojet based on ground-based magnetometer data during solar minimum in fall"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2007ja012524"},{"@type":"CROSSREF","@value":"10.1029/2022ja030691_references_DOI_69ZmfttAZoXlhAOpd00QZQ5yo6d"},{"@type":"CROSSREF","@value":"10.1186/s40623-015-0373-1_references_DOI_69ZmfttAZoXlhAOpd00QZQ5yo6d"},{"@type":"CROSSREF","@value":"10.1029/2021sw002831_references_DOI_69ZmfttAZoXlhAOpd00QZQ5yo6d"},{"@type":"CROSSREF","@value":"10.1088/1742-6596/852/1/012015_references_DOI_69ZmfttAZoXlhAOpd00QZQ5yo6d"},{"@type":"CROSSREF","@value":"10.1029/2021ja029903_references_DOI_69ZmfttAZoXlhAOpd00QZQ5yo6d"},{"@type":"CROSSREF","@value":"10.1109/iconspace.2015.7283763_references_DOI_69ZmfttAZoXlhAOpd00QZQ5yo6d"}]}