{"@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/1360004229806106496.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/2016ja022633"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2016JA022633"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JA022633"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Shrinking equatorial plasma bubbles"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>The formation of equatorial plasma bubbles (EPBs) associated with spread <jats:italic>F</jats:italic> irregularities are fairly common phenomenon in the postsunset equatorial ionosphere. These bubbles grow as a result of eastward polarization electric field resulting in upward <jats:italic>E</jats:italic> × <jats:italic>B</jats:italic> drift over the dip equator. As they grow they are also mapped to low latitudes along magnetic field lines. The EPBs are often observed as airglow depletions in the images of OI 630 nm emission. On occasions the growth of the features over the dip equator is observed as poleward extensions of the depletions in all‐sky images obtained from low latitudes. Herein, we present interesting observations of decrease in the latitudinal extent of the EPBs corresponding to a reduction in their apex altitudes over the dip equator. Such observations indicate that these bubbles not only grow but also shrink on occasions. These are the first observations of shrinking EPBs. The observations discussed in this work are based on all‐sky airglow imaging observations of OI 630.0 nm emission made from Panhala (11.1°N dip latitude). In addition, ionosonde observations made from dip equatorial site Tirunelveli (1.1°N dip latitude) are used to understand the phenomenon better. The analysis indicates that the speed of shrinking occurring in the topside is different from the bottomside vertical drifts. When the EPBs shrink, they might decay before sunrise hours.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004229806106123","@type":"Researcher","foaf:name":[{"@value":"V. L. Narayanan"}],"jpcoar:affiliationName":[{"@value":"Indian Institute of Science Education and Research Mohali  Mohali India"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806106243","@type":"Researcher","foaf:name":[{"@value":"S. Gurubaran"}],"jpcoar:affiliationName":[{"@value":"Indian Institute of Geomagnetism  Mumbai India"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806106496","@type":"Researcher","foaf:name":[{"@value":"K. Shiokawa"}],"jpcoar:affiliationName":[{"@value":"Institute for Space‐Earth Environmental Research Nagoya University  Nagoya Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806106244","@type":"Researcher","foaf:name":[{"@value":"K. Emperumal"}],"jpcoar:affiliationName":[{"@value":"Equatorial Geophysical Research Laboratory Indian Institute of Geomagnetism  Tirunelveli India"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699380"},{"@type":"EISSN","@value":"21699402"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2016-07","prism:volume":"121","prism:number":"7","prism:startingPage":"6924","prism:endingPage":"6935"},"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/10.1002%2F2016JA022633"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JA022633"}],"createdAt":"2016-07-02","modifiedAt":"2023-09-09","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282256810520448","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15H05815"},{"@type":"JGN","@value":"JP15H05815"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-15H05815/"}],"notation":[{"@language":"ja","@value":"地球電磁気圏擾乱現象の発生機構の解明と予測"},{"@language":"en","@value":"Understanding and prediction of geospace dynamics"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002216708878080","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Simultaneous observations at Darwin of equatorial bubbles by ionosonde-based range/time displays and airglow imaging"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011143894899200","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Zonal velocity of the equatorial plasma bubbles over Kolhapur, India"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011144811905408","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Numerical analysis of global ionospheric current system including the effect of equatorial enhancement"}]},{"@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 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