{"@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/1361412893055899392.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018je005779"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JE005779"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018JE005779"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018JE005779"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JE005779"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Formation of the Y Feature at the Venusian Cloud Top by Planetary‐Scale Waves and the Mean Circulation: Analysis of Venus Express VMC Images"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>The relationship between the planetary‐scale ultraviolet contrast known as the Y feature and the wind field at the Venusian cloud top was investigated by using images obtained by Venus Monitoring Camera (VMC) on ESA's Venus Express. Spectral analyses of the ultraviolet reflectivity and the wind field revealed common periodicities of 4–5 Earth days, which are attributed to Kelvin and Rossby waves with a zonal wave number of unity. Combined with the morphological relationship between the dark streaks and the enhancement of poleward flow, we propose a mechanism for the formation of the Y feature: The dark materials are supplied to the cloud top in the equatorial region by a Kelvin wave, subsequently advected poleward by the mean meridional circulation and a Rossby wave, and then stretched by the midlatitude jet to the tilted band structures. A simplified transport model was developed to demonstrate the scenario.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381412893055899399","@type":"Researcher","foaf:name":[{"@value":"Y. Nara"}],"jpcoar:affiliationName":[{"@value":"Department of Complexity Science and Engineering, Graduate School of Frontier Sciences The University of Tokyo  Kashiwa Chiba Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899271","@type":"Researcher","foaf:name":[{"@value":"T. Imamura"}],"jpcoar:affiliationName":[{"@value":"Department of Complexity Science and Engineering, Graduate School of Frontier Sciences The University of Tokyo  Kashiwa Chiba Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899268","@type":"Researcher","foaf:name":[{"@value":"S. Murakami"}],"jpcoar:affiliationName":[{"@value":"Institute of Space and Astronautical Science Japan Aerospace Exploration Agency  Sagamihara Kanagawa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899403","@type":"Researcher","foaf:name":[{"@value":"T. Kouyama"}],"jpcoar:affiliationName":[{"@value":"National Institute of Advanced Industrial Science and Technology  Koto‐ku Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899653","@type":"Researcher","foaf:name":[{"@value":"K. Ogohara"}],"jpcoar:affiliationName":[{"@value":"Department of Electronic System Engineering, School of Engineering The University of Shiga Prefecture  Hikone Shiga Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899393","@type":"Researcher","foaf:name":[{"@value":"M. Yamada"}],"jpcoar:affiliationName":[{"@value":"Planetary Exploration Research Center Chiba Institute of Technology  Narashino Chiba Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899525","@type":"Researcher","foaf:name":[{"@value":"M. Takagi"}],"jpcoar:affiliationName":[{"@value":"Faculty of Science Kyoto Sangyo University  Kyoto Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899528","@type":"Researcher","foaf:name":[{"@value":"H. Kashimura"}],"jpcoar:affiliationName":[{"@value":"Center for Planetary Science/Department of Planetology, Graduate School of Science Kobe University  Kobe Hyogo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412893055899401","@type":"Researcher","foaf:name":[{"@value":"N. Sato"}],"jpcoar:affiliationName":[{"@value":"Natural Science Division Tokyo Gakugei University  Koganei Tokyo Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699097"},{"@type":"EISSN","@value":"21699100"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Planets"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2019-05","prism:volume":"124","prism:number":"5","prism:startingPage":"1143","prism:endingPage":"1156"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JE005779"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018JE005779"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018JE005779"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JE005779"}],"createdAt":"2019-04-10","modifiedAt":"2023-09-09","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781956227712","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17H02961"},{"@type":"JGN","@value":"JP17H02961"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17H02961/"}],"notation":[{"@language":"ja","@value":"光化学結合GCMと地上観測による金星上層大気の運動と物質循環の解明"},{"@language":"en","@value":"Dynamics and material circulation in the Venus upper atmosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256872651904","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"16H02231"},{"@type":"JGN","@value":"JP16H02231"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16H02231/"}],"notation":[{"@language":"ja","@value":"金星探査機と地上観測の連携による金星大気の物質循環の解明"},{"@language":"en","@value":"Unveiling the material circulation in the Venusian atmosphere with coordinated spacecraft and ground-based observations"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050012570393551360","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction"}]},{"@id":"https://cir.nii.ac.jp/crid/1360005518173730176","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Planetary‐Scale Variations in Winds and UV Brightness at the Venusian Cloud Top: Periodicity and Temporal Evolution"}]},{"@id":"https://cir.nii.ac.jp/crid/1360008697851467264","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Vertical Coupling Between the Cloud‐Level Atmosphere and the Thermosphere of Venus Inferred From the Simultaneous Observations by Hisaki and Akatsuki"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142935145984","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Venus's major cloud feature as an equatorially trapped wave distorted by the wind"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142935331072","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The relationship between mesoscale circulation and cloud morphology at the upper cloud level of Venus from VMC/Venus Express"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142936020352","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Etude de la rotation rétrograde, en 4 jours, de la couche extérieure nuageuse de Vénus"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142936844928","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Solar and thermal radiation in the Venus atmosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142938817280","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Studies in astronomical time series analysis. 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