{"@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/1363670320973542016.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/ja088ia09p07015"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2FJA088iA09p07015"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/JA088iA09p07015"}}],"dc:title":[{"@value":"Satellite observations of Pi 2 activity at synchronous orbit"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Pi 2 magnetic pulsations are frequently observed at synchronous orbit by the UCLA fluxgate magnetometer on ATS 6. Events that occurred in September 1974 have been studied by using digital power spectra and coherency analysis to determine wave characteristics. From examination of wave form and application of spectral analysis, these Pi 2 events can be divided into three types. The first is a superposition of a 100‐s oscillation and a large‐amplitude, higher‐frequency Pi 1 activity. The second is a 100‐s wave unaccompanied by Pi 1. Both types have a significant compressional component. The third is a pure transverse wave in the azimuthal component. The pure transverse waves are quite rare, while the compressional waves occur during almost every substorm. In general, if the satellite is in the local time sector 1900–0300 LT, a Pi 2 burst accompanies every onset. In addition, onsets at the satellite are associated with ground Pi 2 bursts. The peak occurrence time of the satellite Pi 2 is 2100 LT. An examination of Pi 2 polarization at the satellite suggests that a polarization reversal occurs around midnight during quiet magnetic conditions (Kp ≤ 3+), left‐handed premidnight and right‐handed postmidnight. This result is similar to that obtained from ground‐based studies at stations equatorward of the auroral electrojet. The initial perturbation in the azimuthal component of a Pi 2 event is in the same sense as the perturbations caused by substorm‐associated, field‐aligned currents, positive (eastward) premidnight, negative (westward) postmidnight. This observation indicates that there may be a very close association between their causative mechanisms.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380285532848685706","@type":"Researcher","foaf:name":[{"@value":"T. Sakurai"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670320973542017","@type":"Researcher","foaf:name":[{"@value":"R. L. McPherron"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1983-09","prism:volume":"88","prism:number":"A9","prism:startingPage":"7015","prism:endingPage":"7027"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2FJA088iA09p07015"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/JA088iA09p07015"}],"createdAt":"2008-02-06","modifiedAt":"2023-09-22","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282810719229056","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Wp index: A new substorm index derived from high-resolution geomagnetic field data at low latitude"},{"@value":"Wp index: A new substorm index derived from high‐resolution geomagnetic field data at low latitude"}]},{"@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/1360848658217172352","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"AKR modulation and global Pi2 oscillation"}]},{"@id":"https://cir.nii.ac.jp/crid/1361131418080098816","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Formation of a 3‐D Oscillatory Current System Associated With Global High‐Correlation Pi 2 Event: A Case Study"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206510990720","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Automated detection of Pi 2 pulsations using wavelet analysis: 2. An application for dayside Pi 2 pulsation study"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206511008256","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"ULF pulsations observed by the ETS-VI satellite"},{"@value":"ULF pulsations observed by the ETS-VI satellite: Substorm associated azimuthal Pc 4 pulsations on the nightside"},{"@value":"ULF pulsations observed by the ETS-VI satellite: Substorm associated azimuthal Pc 4 pulsation on the nightside"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206512844288","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Longitudinal dependence of characteristics of low-latitude Pi2 pulsations observed at Kakioka and Hermanus"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681489998848","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"A Pi2-associated dusk-to-dawn currents in the midnight sector as observed at <I> L</I> = 6.6 during multiple Pi2 onsets"},{"@value":"A Pi2-associated dusk-to-dawn currents in the midnight sector as observed at L = 6.6 during multiple Pi2 onsets"},{"@language":"ja-Kana","@value":"Pi2 associated dusk to dawn currents in the midnight sector as observed at L 6 6 during multiple Pi2 onsets"}]},{"@id":"https://cir.nii.ac.jp/crid/2050025942186655232","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Analysis of propagation delays of compressional Pi 2 waves between geosynchronous altitude and low latitudes"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/ja088ia09p07015"},{"@type":"OPENAIRE","@value":"doi_dedup___::c700ab70b4de692b58d3a6dedc8bab51"},{"@type":"CROSSREF","@value":"10.1186/bf03352528_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1186/bf03352087_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1186/bf03352206_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1029/2012sw000785_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1186/1880-5981-66-20_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1186/bf03351981_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1002/2015ja021698_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1029/2010ja016042_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"},{"@type":"CROSSREF","@value":"10.1029/2019ja026988_references_DOI_PumuQJgpomdWeQw86KbE1gNGxGN"}]}