{"@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/1363388844564735488.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2009ja014439"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2009JA014439"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2009JA014439"}}],"dc:title":[{"@value":"First tomographic observations of the Midlatitude Summer Nighttime Anomaly over Japan"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Recently, a chain of digital beacon receivers has been established over Japan, mainly for the tomographic imaging of the ionosphere. These receivers are installed at Shionomisaki (33.45°N, 135.8°E), Shigaraki (34.85°N, 136.1°E), and Fukui (36.06°N,136°E), which continuously track the Low Earth Orbiting Satellites (LEOS), and the simultaneous line‐of‐sight Total Electron Content (TEC) data are used for tomographic reconstruction. In the images obtained during July 2008, it is seen that the nighttime electron densities exceed the daytime values on almost all days over latitudes >33–34°N. On several days, these northern latitudes show enhanced electron densities compared to the low‐latitude region during nighttime. These are the prominent features of the “Midlatitude Summer Nighttime Anomaly (MSNA)” that is recently observed in the northern hemisphere and is considered similar to the nighttime Weddell Sea Anomaly (WSA). This is the first study of the MSNA using tomographic technique and found its significant day‐to‐day variability. The ionosonde data from Wakkanai (45.4°N, 141.7° E), ground‐based GPS TEC observations using the GEONET, CHAMP in situ electron density measurements, and Formosat3/COSMIC (F3/C) occultation measurements are also used to confirm the presence of MSNA over this region and to examine its variability. It is seen that, in general, during the local summer period, electron density over the northern latitudes is highest at ∼2000–2100 LT and the latitudinal enhancement in electron density also begins to appear around the same time, which continues to exist even at later hours.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383388844564735489","@type":"Researcher","foaf:name":[{"@value":"Smitha V. Thampi"}],"jpcoar:affiliationName":[{"@value":"Research Institute for Sustainable Humanosphere Kyoto University  Kyoto Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1383388844564735491","@type":"Researcher","foaf:name":[{"@value":"Charles Lin"}],"jpcoar:affiliationName":[{"@value":"Plasma and Space Science Center National Cheng Kung University  Tainan Taiwan"},{"@value":"Institute of Space, Astrophysical and Plasma Sciences National Cheng Kung University  Tainan Taiwan"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326224168320","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"70589639"},{"@type":"NRID","@value":"1000070589639"},{"@type":"NRID","@value":"9000023031296"},{"@type":"NRID","@value":"9000016883864"},{"@type":"NRID","@value":"9000265539303"},{"@type":"NRID","@value":"9000024362611"},{"@type":"NRID","@value":"9000016907804"},{"@type":"NRID","@value":"9000024359744"},{"@type":"NRID","@value":"9000337100867"},{"@type":"NRID","@value":"9000404333926"},{"@type":"NRID","@value":"9000025009983"},{"@type":"NRID","@value":"9000288831597"},{"@type":"NRID","@value":"9000018699292"},{"@type":"NRID","@value":"9000242385414"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/huixin"}],"foaf:name":[{"@value":"Huixin Liu"}],"jpcoar:affiliationName":[{"@value":"Research Institute for Sustainable Humanosphere Kyoto University  Kyoto Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1383388844564735488","@type":"Researcher","foaf:name":[{"@value":"Mamoru Yamamoto"}],"jpcoar:affiliationName":[{"@value":"Research Institute for Sustainable Humanosphere Kyoto University  Kyoto Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2009-10","prism:volume":"114","prism:number":"A10","prism:startingPage":"A10318"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2009JA014439"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2009JA014439"}],"createdAt":"2009-10-30","modifiedAt":"2023-10-30","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360283689327317632","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Thermospheric wind observed by GOCE: Wind jets and seasonal variations"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285708264493568","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Comparison of FORMOSAT‐3/COSMIC radio occultation measurements with radio tomography"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285708265318016","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Long‐term variations of the nighttime electron density enhancement during the ionospheric midlatitude summer"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567180128491264","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Thermospheric tidal effects on the ionospheric midlatitude summer nighttime anomaly using SAMI3 and TIEGCM"}]},{"@id":"https://cir.nii.ac.jp/crid/1360580230583817856","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Ionospheric Topside Diffusive Flux and the Formation of Summer Nighttime Ionospheric Electron Density Enhancement Over Millstone Hill"}]},{"@id":"https://cir.nii.ac.jp/crid/2050025942184851200","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"First results from the ionospheric tomography experiment using beacon TEC data obtained by means of a network along a longitude of 136°E over Japan"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2009ja014439"},{"@type":"OPENAIRE","@value":"doi_dedup___::0b0142a49e5c2ff610e21da1e88cd714"},{"@type":"CROSSREF","@value":"10.1002/2016ja022938_references_DOI_QxNnWaFLdl9hBv3BOe940u0Sfdn"},{"@type":"CROSSREF","@value":"10.1029/2010rs004431_references_DOI_QxNnWaFLdl9hBv3BOe940u0Sfdn"},{"@type":"CROSSREF","@value":"10.1029/2011ja017138_references_DOI_QxNnWaFLdl9hBv3BOe940u0Sfdn"},{"@type":"CROSSREF","@value":"10.5047/eps.2009.10.003_references_DOI_QxNnWaFLdl9hBv3BOe940u0Sfdn"},{"@type":"CROSSREF","@value":"10.1002/jgra.50340_references_DOI_QxNnWaFLdl9hBv3BOe940u0Sfdn"},{"@type":"CROSSREF","@value":"10.1029/2021gl097651_references_DOI_9oWuj2vBSpLbkjfTEoPXUzgHpsS"}]}