{"@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/1360021391856319872.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1007/s10291-022-01321-4"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/content/pdf/10.1007/s10291-022-01321-4.pdf"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/article/10.1007/s10291-022-01321-4/fulltext.html"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"A study of equatorial plasma bubble structure using VHF radar and GNSS scintillations over the low-latitude regions"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Ionospheric irregularities can cause detrimental effects on the global navigation satellite system (GNSS) signals, often in the form of rapid fluctuations in both amplitude and phase. Over the low-latitude regions, the equatorial plasma bubble (EPB) frequently arises after sunset, leading to GNSS scintillations since the signals propagate through ionospheric irregularities. The relationship between amplitude ionospheric scintillations (S4 index) on GNSS signals and EPB characteristics is presented. We investigate the geometrical relationship between backscatter echoes associated with the EPB and the multi-constellation and multi-frequency scintillations, specifically, GPS and Galileo constellations with L1/E1 and L5/E5a signals. By analyzing the GNSS scintillations along the GNSS signal paths, the GNSS ionospheric pierce points (IPPs) are mapped with S4 index at different altitudes and projected along the magnetic field line together with the backscatter echoes at the equatorial atmosphere radar (EAR), West Sumatra, Indonesia. Our results are obtained for moderate scintillation cases due to limited data available for this study. The results show the EPB impact ionospheric scintillations. The S4 index on the L5/E5a signal is more susceptible to scintillations than the L1/E1 signal. Moreover, we found a high correlation between EAR backscatter echoes and S4 values on both L1/E1 and L5/E5a at an altitude between 250 and 350 km, indicating that the EPB occurs on the bottomside of the ionosphere.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021391856319872","@type":"Researcher","foaf:name":[{"@value":"Acharaporn Bumrungkit"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391856320000","@type":"Researcher","foaf:name":[{"@value":"Pornchai Supnithi"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391856320016","@type":"Researcher","foaf:name":[{"@value":"Susumu Saito"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391856319879","@type":"Researcher","foaf:name":[{"@value":"Lin Min Min Myint"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"10805370"},{"@type":"EISSN","@value":"15211886"}],"prism:publicationName":[{"@value":"GPS Solutions"}],"dc:publisher":[{"@value":"Springer Science and Business Media LLC"}],"prism:publicationDate":"2022-09-30","prism:volume":"26","prism:number":"4","prism:startingPage":"148"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["https://creativecommons.org/licenses/by/4.0","https://creativecommons.org/licenses/by/4.0"],"url":[{"@id":"https://link.springer.com/content/pdf/10.1007/s10291-022-01321-4.pdf"},{"@id":"https://link.springer.com/article/10.1007/s10291-022-01321-4/fulltext.html"}],"createdAt":"2022-09-30","modifiedAt":"2022-10-15","project":[{"@id":"https://cir.nii.ac.jp/crid/1040848250647691776","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20H00197"},{"@type":"JGN","@value":"JP20H00197"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H00197/"}],"notation":[{"@language":"ja","@value":"レーダー観測網・複数衛星・モデル計算を総合した赤道域電離圏変動特性の国際共同研究"},{"@language":"en","@value":"International study of equatorial ionosphere based on observations and models"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282813185827968","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Observation of equatorial plasma bubbles by the airglow imager on ISS-IMAP"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145123843456","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Linear theory and modeling of the Rayleigh‐Taylor instability leading to the occurrence of equatorial spread <i>F</i>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021390563033728","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Simultaneous equatorial plasma bubble observation using amplitude scintillations from GNSS and LEO satellites in low-latitude region"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021393305167488","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Ionosonde Observations of Spread F and Spread Es at Low and Middle Latitudes during the Recovery Phase of the 7–9 September 2017 Geomagnetic Storm"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021396523970560","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"An investigation of tilted aspect‐sensitive scatterers in the lower atmosphere using the MU and Aberystwyth VHF radars"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021396524125056","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A study on equatorial plasma bubbles over Indian sub-continent using various satellite constellations and techniques"}]},{"@id":"https://cir.nii.ac.jp/crid/1360302867629632768","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The Ionospheric Scintillation Effects on the BeiDou Signal Receiver"}]},{"@id":"https://cir.nii.ac.jp/crid/1360302871320497280","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Scintillation modeling using in situ data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360302871320846592","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Multi-constellation GBAS: How to benefit from a second constellation"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567179757649408","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Predawn plasma bubble cluster observed in Southeast Asia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574094933854976","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Radio wave scintillations in the ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574095479412736","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Time evolution and dynamics of equatorial backscatter plumes 1. 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