{"@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/1360004232245208704.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.jastp.2012.07.008"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1364682612001848?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1364682612001848?httpAccept=text/plain"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Climatology of the inter-hemispheric field-aligned currents system over the Nigeria ionosphere"}],"description":[{"notation":[{"@value":"Abstract   Records of the declination ( D ) magnetic field data for the year 2009 from the Magnetic Data Acquisition System (MAGDAS) facilities at University of Ilorin were employed for this work. From the minutes value of the D-component, the deduced hourly values of the D-component ( S   q  ( QD )) were used to estimate its diurnal ( S   q  ( D )) values with the most five quietest days identified. The monthly mean ( MS   q  ( D )) of the most five quietest days and their seasonal ( SS   q  ( D )) variabilities were investigated. The inter-hemispheric field aligned currents (IHFACs) exhibit downward and upward inter-hemispheric field-aligned sheet current that appears as a pair at all local times of the  S   q  ( D ),  MS   q  ( D ), and  SS   q  ( D ) variations. From these variabilities, the IHFACs were observed to flow from the winter to summer hemisphere during noon and dusk sector and flowing in opposite direction during the dawn sector. The  S   q  ( D ) variability patterns that were observed in May, June, August September are gentle compared to the disturbed variabilities in January, February, March and November. The highest positive (∼1.7 arc-min) and negative (∼−2.7 arc min)  MS q  ( D ) maxima values were observed in August during the dawn and noon sectors respectively. These values indicated that the IHFACs flow in August is strongly southbound (positive) and northbound (negative) in the dawn and noon sectors respectively. Dusk-side IHFACs as can be observed by MAGDAS are weakly northbound in all the seasons. The direction of IHFACs does not flip at the equinoxes but in June and November and does not become largest at solstices but in August. The IHFACs was observed to exhibit longitudinal variability, which indicated that larger amplitude of winter-to-summer IHFACs is observed to be greater in June solstice (northbound/negative IHFACs) than in the December solstice (southbound/positive IHFACs) during the noon sector."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004232245208706","@type":"Researcher","foaf:name":[{"@value":"O.S. Bolaji"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232245208705","@type":"Researcher","foaf:name":[{"@value":"A.B. Rabiu"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232245208704","@type":"Researcher","foaf:name":[{"@value":"E.O. Oyeyemi"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232245208707","@type":"Researcher","foaf:name":[{"@value":"K. Yumoto"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"13646826"}],"prism:publicationName":[{"@value":"Journal of Atmospheric and Solar-Terrestrial Physics"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2012-11","prism:volume":"89","prism:startingPage":"144","prism:endingPage":"153"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S1364682612001848?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S1364682612001848?httpAccept=text/plain"}],"createdAt":"2012-08-23","modifiedAt":"2019-07-02","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782106394496","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22253007"},{"@type":"JGN","@value":"JP22253007"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22253007/"}],"notation":[{"@language":"ja","@value":"大規模電離圏電流の観測に基づく太陽圏ー磁気圏ー電離圏ー大気圏結合過程の研究"},{"@language":"en","@value":"Study on the Couplings of Heliosphere-Magnetosphere-Ionosphere-Atmosphere by Global Sq Current Observation"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050295027686608000","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Seasonal variation of inter-hemispheric field-aligned currents deduced from time-series analysis of the equatorial geomagnetic field data during solar cycle 23-24"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145195908736","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Coherence of geomagnetic<i>DP</i>2 fluctuations with interplanetary magnetic variations"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145203609856","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Quantitative patterns of large‐scale field‐aligned currents in the auroral ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011146457647616","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Solstitial S-currents through the magnetosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292621493069056","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Role of the magnetospheric and ionospheric currents in the generation of the equatorial scintillations during geomagnetic storms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567182198730880","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Features of the inter-hemispheric field-aligned current system over Malaysia ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855568460680320","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Field-aligned current induced by asymmetric dynamo action in the ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044320050176","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Seasonal and local time dependences of the interhemispheric field‐aligned currents deduced from the Ørsted satellite and the ground geomagnetic observations"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137045117561216","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Features of global geomagnetic <i>Sq</i> field from 1980 to 1990"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137045494458112","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Mathematical Models of Magnetospheric Convection and its Coupling to the Ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137045507338240","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519769646208","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Classification of polar magnetic disturbances"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519915035520","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Equatorial electric fields during magnetically disturbed conditions 1. 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