{"@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/1360004233291616512.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018gl078731"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018GL078731"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078731"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018GL078731"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/am-pdf/10.1029/2018GL078731"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078731"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Impulsively Excited Nightside Ultralow Frequency Waves Simultaneously Observed on and off the Magnetic Equator"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>The Arase spacecraft is capable of observing ultralow frequency waves in the inner magnetosphere at intermediate magnetic latitudes, a region sparsely covered by previous spacecraft missions. We report a series of impulsively excited fundamental toroidal mode standing Alfvén waves in the midnight sector observed by Arase outside the plasmasphere at magnetic latitudes 13–24°. The wave onsets are concurrent with Pi2 onsets detected by the Van Allen Probe B spacecraft at the magnetic equator in the duskside plasmasphere and by ground magnetometers at low latitudes. The duration of each toroidal wave packet is ∼20 min, which is much longer than that of the corresponding Pi2 wave packet. The toroidal waves cannot be the source of high‐latitude Pi2 waves because they were not detected on the ground near the magnetic field footprint of Arase. Overall, the toroidal wave event lasted more than 2 hr and allowed us to use the wave frequency to estimate the plasma mass density at <jats:italic>L</jats:italic> = 6.1–8.3. The mass density (in amu/cm<jats:sup>3</jats:sup>) is higher than the electron density (cm<jats:sup>−3</jats:sup>) by a factor of ∼6, which implies that 17–33% of the ions were O<jats:sup>+</jats:sup>.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004233291616388","@type":"Researcher","foaf:name":[{"@value":"Kazue Takahashi"}],"jpcoar:affiliationName":[{"@value":"The Johns Hopkins University Applied Physics Laboratory  Laurel MD USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233291616392","@type":"Researcher","foaf:name":[{"@value":"Richard E. 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Rodriguez"}],"jpcoar:affiliationName":[{"@value":"National Centers for Environmental Information National Oceanic and Atmospheric Administration  Boulder CO USA"},{"@value":"Cooperative Institute for Research in Environmental Sciences University of Colorado at Boulder  Boulder CO 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":"2018-08-17","prism:volume":"45","prism:number":"16","prism:startingPage":"7918","prism:endingPage":"7926"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#am","http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018GL078731"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078731"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018GL078731"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/am-pdf/10.1029/2018GL078731"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078731"}],"createdAt":"2018-07-25","modifiedAt":"2025-03-12","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781899067648","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"16H04057"},{"@type":"JGN","@value":"JP16H04057"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16H04057/"}],"notation":[{"@language":"ja","@value":"衛星多点観測と計算機シミュレーションによる内部磁気圏のイオン組成変化要因の探究"},{"@language":"en","@value":"Investigation of ion composition change in the inner magnetosphere based on multi-satellite observations and numerical simulations"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781974743552","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17K18804"},{"@type":"JGN","@value":"JP17K18804"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K18804/"}],"notation":[{"@language":"ja","@value":"磁気インピーダンスセンサーによる地磁気観測実験と稠密観測網展開可能性の探索"},{"@language":"en","@value":"Experiment of geomagnetic field observation by magneto-impedance sensor and study for possibility of deployment of dense magnetometer 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