{"@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/1361981471016390656.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.5194/angeo-24-1317-2006"}},{"identifier":{"@type":"URI","@value":"https://angeo.copernicus.org/articles/24/1317/2006/angeo-24-1317-2006.pdf"}}],"dc:title":[{"@value":"Observations and modeling of post-midnight uplifts near the magnetic equator"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Abstract. We report here on post-midnight uplifts near the magnetic equator. We present observational evidence from digital ionosondes in Brazil, a digisonde in Peru, and other measurements at the Jicamarca Radio Observatory that show that these uplifts occur fairly regularly in the post-midnight period, raising the ionosphere by tens of kilometers in the most mild events and by over a hundred kilometers in the most severe events. We show that in general the uplifts are not the result of a zonal electric field reversal, and demonstrate instead that the uplifts occur as the ionospheric response to a decreasing westward electric field in conjunction with sufficient recombination and plasma flux. The decreasing westward electric field may be caused by a change in the wind system related to the midnight pressure bulge, which is associated with the midnight temperature maximum. In order to agree with observations from Jicamarca and Palmas, Brazil, it is shown that there must exist sufficient horizontal plasma flux associated with the pressure bulge. In addition, we show that the uplifts may be correlated with a secondary maximum in the spread-F occurrence rate in the post-midnight period. The uplifts are strongly seasonally dependent, presumably according to the seasonal dependence of the midnight pressure bulge, which leads to the necessary small westward field in the post-midnight period during certain seasons. We also discuss the enhancement of the uplifts associated with increased geomagnetic activity, which may be related to disturbance dynamo winds. Finally, we show that it is possible using simple numerical techniques to estimate the horizontal plasma flux and the vertical drift velocity from electron density measurements in the post-midnight period.\n                    </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381131421817055109","@type":"Researcher","foaf:name":[{"@value":"M. J. Nicolls"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390659","@type":"Researcher","foaf:name":[{"@value":"M. C. Kelley"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390784","@type":"Researcher","foaf:name":[{"@value":"M. N. Vlasov"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390661","@type":"Researcher","foaf:name":[{"@value":"Y. Sahai"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390663","@type":"Researcher","foaf:name":[{"@value":"J. L. Chau"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390658","@type":"Researcher","foaf:name":[{"@value":"D. L. Hysell"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390662","@type":"Researcher","foaf:name":[{"@value":"P. R. Fagundes"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390660","@type":"Researcher","foaf:name":[{"@value":"F. Becker-Guedes"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471016390656","@type":"Researcher","foaf:name":[{"@value":"W. L. C. Lima"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"14320576"}],"prism:publicationName":[{"@value":"Annales Geophysicae"}],"dc:publisher":[{"@value":"Copernicus GmbH"}],"prism:publicationDate":"2006-07-03","prism:volume":"24","prism:number":"5","prism:startingPage":"1317","prism:endingPage":"1331"},"reviewed":"false","dc:rights":["https://creativecommons.org/licenses/by/3.0/"],"url":[{"@id":"https://angeo.copernicus.org/articles/24/1317/2006/angeo-24-1317-2006.pdf"}],"createdAt":"2010-06-15","modifiedAt":"2021-01-28","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/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/1360004233290222208","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@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"}]},{"@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/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/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":"10.5194/angeo-24-1317-2006"},{"@type":"CROSSREF","@value":"10.1002/2014ja020878_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"},{"@type":"CROSSREF","@value":"10.1029/2012ja017692_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"},{"@type":"CROSSREF","@value":"10.1002/2015gl067432_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"},{"@type":"CROSSREF","@value":"10.1029/2020ja028902_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"},{"@type":"CROSSREF","@value":"10.1002/2016ja023024_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"},{"@type":"CROSSREF","@value":"10.1002/2017ja024048_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"},{"@type":"CROSSREF","@value":"10.1186/s40645-018-0212-7_references_DOI_RE8UEj8pc0zTlrxLjJy70sYRaox"}]}