{"@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/1360004233290222208.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2012ja017692"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2012JA017692"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2012JA017692"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"On post‐midnight field‐aligned irregularities observed with a 30.8‐MHz radar at a low latitude: Comparison with<i>F</i>‐layer altitude near the geomagnetic equator"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>We investigated the relationship between post‐midnight<jats:italic>F</jats:italic>‐region field aligned irregularities (FAIs) and<jats:italic>F</jats:italic>‐layer altitude by analyzing data of a 30.8‐MHz radar installed 5at Kototabang, Indonesia (0.2°S, 100.3°E; geomagnetic latitude 10.4°S) and an ionosonde installed at Chumphon, Thailand (10.7°N, 99.4°E; geomagnetic latitude 3.3°N). Chumphon is located near the geomagnetic equator on approximately the same meridian as Kototabang. Case studies show that the altitude of the<jats:italic>F</jats:italic>‐layer rose at Chumphon a half hour before the post‐midnight FAIs appeared at Kototabang. The Doppler velocity of the<jats:italic>E</jats:italic>‐region FAIs observed simultaneously by the 30.8‐MHz radar was downward, indicating that the<jats:italic>F</jats:italic>‐layer uplift was not caused by the electric field. We also investigated seasonal variations of the post‐midnight FAI occurrence and the<jats:italic>F</jats:italic>‐layer altitude. Both the post‐midnight FAIs and the uplift of the<jats:italic>F</jats:italic>‐layer were frequently seen around midnight between May and August. The seasonal variation of the midnight<jats:italic>F</jats:italic>‐layer uplift around the geomagnetic equator coincided with that of the post‐midnight FAI occurrence at Kototabang. These results suggest that the uplift of the<jats:italic>F</jats:italic>‐layer would play an important role in the generation of post‐midnight FAIs. We evaluated the linear growth rate of the Rayleigh‐Taylor instability based on the altitude of the<jats:italic>F</jats:italic>‐layer observed at Chumphon. The result shows that the uplift of the<jats:italic>F</jats:italic>‐layer can enhance the growth rate because gravity‐driven eastward electric current increases. Therefore, we interpret that the observed FAIs were accompanied by plasma bubble, the growth rate of which was reinforced by the uplifted<jats:italic>F</jats:italic>‐layer.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004233290222210","@type":"Researcher","foaf:name":[{"@value":"M. Nishioka"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222337","@type":"Researcher","foaf:name":[{"@value":"Y. Otsuka"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222220","@type":"Researcher","foaf:name":[{"@value":"K. Shiokawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222222","@type":"Researcher","foaf:name":[{"@value":"T. Tsugawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222217","@type":"Researcher","foaf:name":[{"@value":"Effendy"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222465","@type":"Researcher","foaf:name":[{"@value":"P. Supnithi"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222225","@type":"Researcher","foaf:name":[{"@value":"T. Nagatsuma"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233290222346","@type":"Researcher","foaf:name":[{"@value":"K. T. Murata"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2012-08","prism:volume":"117","prism:number":"A8","prism:startingPage":"A08337"},"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%2F2012JA017692"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2012JA017692"}],"createdAt":"2012-07-24","modifiedAt":"2023-10-30","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782113716992","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22403011"},{"@type":"JGN","@value":"JP22403011"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22403011/"}],"notation":[{"@language":"ja","@value":"インド・東南アジア・太平洋の広域観測による赤道スプレッド F 現象の日々変動の解明"},{"@language":"en","@value":"Study of day-to-day variability of equatorial Spread-F based on large-area observations over India, southeast Asia, and Pacific"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050845763736019072","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Coordinated observations of postmidnight irregularities and thermospheric neutral winds and temperatures at low latitudes"}]},{"@id":"https://cir.nii.ac.jp/crid/1360001114027745408","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Control of the seasonal and longitudinal occurrence of equatorial scintillations by the longitudinal gradient in integrated <i>E</i> region Pedersen conductivity"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004229802359296","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Explicit characteristics of evolutionary‐type plasma bubbles observed from Equatorial Atmosphere Radar during the low to moderate solar activity years 2010–2012"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011144224402176","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A simple model of the vertical distribution of electron concentration in the ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360017282443465600","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Propagation Mechanism of Medium Wave Broadcasting Waves Observed by the Arase Satellite: Hectometric Line Spectra"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285708265262720","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On postmidnight low-latitude ionospheric irregularities during solar minimum: 2. C/NOFS observations and comparisons with the Equatorial Atmosphere Radar"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292619309746432","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Average vertical and zonal F region plasma drifts over Jicamarca"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620065348608","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Turbulent upwelling of the mid‐latitude ionosphere: 2. Theoretical framework"}]},{"@id":"https://cir.nii.ac.jp/crid/1360298757412383488","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Challenges to Equatorial Plasma Bubble and Ionospheric Scintillation Short-Term Forecasting and Future Aspects in East and Southeast Asia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567179757409536","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Altitude development of postmidnight <i>F</i> region field‐aligned irregularities observed using Equatorial Atmosphere Radar in Indonesia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567183241974144","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On postmidnight low-latitude ionospheric irregularities during solar minimum: 1. Equatorial Atmosphere Radar and GPS-TEC observations in Indonesia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574094115289600","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Spread F occurrence over a southern anomaly crest location in Brazil during June solstice of solar minimum activity"}]},{"@id":"https://cir.nii.ac.jp/crid/1360576118797089024","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Anomalous Increase in the Occurrence of Post‐Midnight FAI Radar Echoes in September 2019 and Its Relation With the Austral Sudden Stratospheric Warming"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848654736297472","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"On the fresh development of equatorial plasma bubbles around the midnight hours of June solstice"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848654738430080","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"First Study on the Occurrence Frequency of Equatorial Plasma Bubbles over West Africa Using an All‐Sky Airglow Imager and GNSS Receivers"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855569411729024","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Thermospheric meridional winds as deduced from ionosonde chain at low and equatorial latitudes and their connection with midnight temperature maximum"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044324673408","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Longitudinal variability of equatorial plasma bubbles observed by DMSP and ROCSAT‐1"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044405882496","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On the spatial relationship of 1‐m equatorial spread <i>F</i> irregularities and plasma bubbles"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044900992768","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Quiet-time variations of F2-layer parameters at Jicamarca and comparison with IRI-2001 during solar minimum"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418518422779520","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A theoretical comparison between apparent and real vertical ionization drift velocities in the equatorial F region"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519433387136","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Spatial relationship of equatorial plasma bubbles and field‐aligned irregularities observed with an all‐sky airglow imager and the Equatorial Atmosphere Radar"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418521090720128","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Climatology of postsunset equatorial spread <i>F</i> over Jicamarca"}]},{"@id":"https://cir.nii.ac.jp/crid/1361981468764183424","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Statistical analysis of the occurrence of medium‐scale traveling ionospheric disturbances over Brazilian low latitudes using OI 630.0 nm emission all‐sky images"}]},{"@id":"https://cir.nii.ac.jp/crid/1361981470336792448","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Longitudinal and seasonal dependence of nighttime equatorial plasma density irregularities during solar minimum detected on the C/NOFS satellite"}]},{"@id":"https://cir.nii.ac.jp/crid/1361981471016390656","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Observations and modeling of post-midnight uplifts near the magnetic equator"}]},{"@id":"https://cir.nii.ac.jp/crid/1362262944676045184","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Modeling study of equatorial ionospheric height and spread <i>F</i> occurrence"}]},{"@id":"https://cir.nii.ac.jp/crid/1362262945333918464","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Plasma bubbles and irregularities in the equatorial ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1362262945954915584","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Characteristics of field-aligned E-region irregularities over Iioka (36°N), Japan—II"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544420979485312","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Altitude‐extended equatorial spread <i>F</i> observed near sunrise terminator over Indonesia"}]},{"@id":"https://cir.nii.ac.jp/crid/1363107369120239104","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Relationship of the onset of equatorial <i>F</i> region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar"}]},{"@id":"https://cir.nii.ac.jp/crid/1363107369363494144","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Turbulent upwelling of the mid‐latitude ionosphere: 1. Observational results by the MU radar"}]},{"@id":"https://cir.nii.ac.jp/crid/1363107369700416128","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Simultaneous rocket probe and radar measurements of equatorial spread <i>F</i>—Transitional and short wavelength results"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388845502417792","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Signatures of equatorial midnight temperature maximum as observed from in situ and ground‐based ionospheric measurements in the Indian sector"}]},{"@id":"https://cir.nii.ac.jp/crid/1363670321131149184","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"VHF radar observations of nighttime F-region field-aligned irregularities over Kototabang, Indonesia"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233268242210944","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Coordinated study of coherent radar backscatter and optical airglow depletions in the central Pacific"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233270763709312","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On the interpretation of the VHF radar echoes from the equatorial lower E region"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233271224411392","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Scintillations, plasma drifts, and neutral winds in the equatorial ionosphere after sunset"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233271227613824","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Medium‐scale equatorial plasma irregularities observed by Coupled Ion‐Neutral Dynamics Investigation sensors aboard the Communication Navigation Outage Forecast System in a prolonged solar minimum"}]},{"@id":"https://cir.nii.ac.jp/crid/1370016864137224320","@type":"Product","relationType":["references"]},{"@id":"https://cir.nii.ac.jp/crid/1370294808914886528","@type":"Product","relationType":["references"]},{"@id":"https://cir.nii.ac.jp/crid/1370298337520171008","@type":"Product","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"VHF radar observations of post‐midnightF‐region field‐aligned irregularities over Indonesia during solar minimum"}]},{"@id":"https://cir.nii.ac.jp/crid/1370298337520171011","@type":"Product","relationType":["references"]},{"@id":"https://cir.nii.ac.jp/crid/1370298337520171012","@type":"Product","relationType":["references"]},{"@id":"https://cir.nii.ac.jp/crid/1370298337520171014","@type":"Product","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"World‐wide daily variations in the height of the maximum electron density of the ionosphericF2 layer"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681488667648","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Imaging observations of the equatorward limit of midlatitude traveling ionospheric disturbances"}]},{"@id":"https://cir.nii.ac.jp/crid/1570572701760072960","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Post-midnight onset of spread-F at Kodaikanal during the June solstice of solar minimum"},{"@value":"Post‐midnight onset of spread‐F at Kodaikanal during the June solstice of solar minimum"}]},{"@id":"https://cir.nii.ac.jp/crid/1570854176030229632","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Occurrence characteristics of plasmabubble derived from global ground-based GPS receiver networks"}]},{"@id":"https://cir.nii.ac.jp/crid/2050025942124959104","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Daily and seasonal variations in the linear growth rate of the Rayleigh-Taylor instability in the ionosphere obtained with GAIA"}]},{"@id":"https://cir.nii.ac.jp/crid/2050870367065763072","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Review of the generation mechanisms of post-midnight irregularities in the equatorial and low-latitude ionosphere"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2012ja017692"},{"@type":"KAKEN","@value":"PRODUCT-13374718"},{"@type":"KAKEN","@value":"PRODUCT-13374810"},{"@type":"OPENAIRE","@value":"doi_dedup___::8cb58cc36d83b8a090eedbdfb768ef47"},{"@type":"CROSSREF","@value":"10.1002/2014ja020878_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1186/s40645-018-0175-8_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1029/2021ja029813_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1007/s10712-020-09613-5_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1002/2015gl067432_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1029/2020ja028902_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1002/2016ja023024_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1002/2017ja024048_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1002/2017ja024602_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"},{"@type":"CROSSREF","@value":"10.1186/s40645-018-0212-7_references_DOI_1LVdWBJStEoDFu5Far1Py7Ozb0P"}]}