{"@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/1360005518173730176.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2019je006065"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2019JE006065"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2019JE006065"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2019JE006065"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JE006065"}},{"identifier":{"@type":"DOI","@value":"10.48550/arxiv.1908.08220"}},{"identifier":{"@type":"HANDLE","@value":"2115/76302"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Planetary‐Scale Variations in Winds and UV Brightness at the Venusian Cloud Top: Periodicity and Temporal Evolution"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Planetary‐scale waves at the Venusian cloud‐top cause periodic variations in both winds and ultraviolet (UV) brightness. While the wave candidates are the 4‐day Kelvin wave and 5‐day Rossby wave with zonal wavenumber 1, their temporal evolutions are poorly understood. Here we conducted a time series analysis of the 365‐nm brightness and cloud‐tracking wind variations, obtained by the UV Imager onboard the Japanese Venus Climate Orbiter Akatsuki from June to October 2017, revealing a dramatic evolution of planetary‐scale waves and corresponding changes in planetary‐scale UV features. We identified a prominent 5‐day periodicity in both the winds and brightness variations, whose phase velocities were slower than the dayside mean zonal winds (or the super‐rotation) by >35 m/s. The reconstructed planetary‐scale vortices were nearly equatorially symmetric and centered at ~35° latitude in both hemispheres, which indicated that they were part of a Rossby wave. The amplitude of wind variation associated with the observed Rossby wave packet was amplified gradually over ~20 days and attenuated over ~50 days. Following the formation of the Rossby wave vortices, brightness variation emerges to form rippling white cloud belts in the 45–60° latitudes of both hemispheres. An ~3.8‐day periodic signals were observed in the zonal wind and brightness variations in the equatorial region before the Rossby wave amplification. Although the amplitude and significance of the 3.8‐day mode were relatively low in the observation season, this feature is consistent with a Kelvin wave, which may be the cause of the dark clusters in the equatorial region.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380005518173730305","@type":"Researcher","foaf:name":[{"@value":"Masataka Imai"}],"jpcoar:affiliationName":[{"@value":"Artificial Intelligence Research Center Advanced Industrial Science and Technology  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326220837376","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"40645876"},{"@type":"NRID","@value":"1000040645876"},{"@type":"NRID","@value":"9000017113859"},{"@type":"NRID","@value":"9000375922330"},{"@type":"NRID","@value":"9000409975511"},{"@type":"NRID","@value":"9000404336087"},{"@type":"NRID","@value":"9000380975147"},{"@type":"NRID","@value":"9000332697338"},{"@type":"NRID","@value":"9000408855139"},{"@type":"NRID","@value":"9000345347157"},{"@type":"NRID","@value":"9000410886404"},{"@type":"NRID","@value":"9000019055107"},{"@type":"NRID","@value":"9000399009906"},{"@type":"NRID","@value":"9000386169055"},{"@type":"NRID","@value":"9000332699977"},{"@type":"NRID","@value":"9000327110440"},{"@type":"NRID","@value":"9000409029538"},{"@type":"NRID","@value":"9000399009900"},{"@type":"NRID","@value":"9000409497253"},{"@type":"NRID","@value":"9000340446009"},{"@type":"NRID","@value":"9000363172447"},{"@type":"NRID","@value":"9000365042496"},{"@type":"NRID","@value":"9000309174000"},{"@type":"NRID","@value":"9000271159502"},{"@type":"NRID","@value":"9000369353664"},{"@type":"NRID","@value":"9000399010009"},{"@type":"NRID","@value":"9000412653050"},{"@type":"NRID","@value":"9000405126045"},{"@type":"NRID","@value":"9000399009821"},{"@type":"NRID","@value":"9000409848502"},{"@type":"NRID","@value":"9000345199795"},{"@type":"NRID","@value":"9000399352154"},{"@type":"NRID","@value":"9000257894149"},{"@type":"NRID","@value":"9000408855706"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/trk"}],"foaf:name":[{"@value":"Toru Kouyama"}],"jpcoar:affiliationName":[{"@value":"Artificial Intelligence Research Center Advanced Industrial Science and Technology  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730306","@type":"Researcher","foaf:name":[{"@value":"Yukihiro Takahashi"}],"jpcoar:affiliationName":[{"@value":"Planetary and Space Group, Department of Cosmosciences, Graduate School of Science Hokkaido University  Sapporo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730177","@type":"Researcher","foaf:name":[{"@value":"Atsushi Yamazaki"}],"jpcoar:affiliationName":[{"@value":"Institute of Space and Astronautical Science Japan Aerospace Exploration Agency  Sagamihara Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730178","@type":"Researcher","foaf:name":[{"@value":"Shigeto Watanabe"}],"jpcoar:affiliationName":[{"@value":"Space Information Center Hokkaido Information University  Ebetsu Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730050","@type":"Researcher","foaf:name":[{"@value":"Manabu Yamada"}],"jpcoar:affiliationName":[{"@value":"Planetary Exploration Research Center Chiba Institute of Technology  Narashino Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730308","@type":"Researcher","foaf:name":[{"@value":"Takeshi Imamura"}],"jpcoar:affiliationName":[{"@value":"Graduate School of Frontier Sciences The University of Tokyo  Kashiwa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730048","@type":"Researcher","foaf:name":[{"@value":"Takehiko Satoh"}],"jpcoar:affiliationName":[{"@value":"Institute of Space and Astronautical Science Japan Aerospace Exploration Agency  Sagamihara Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730179","@type":"Researcher","foaf:name":[{"@value":"Masato Nakamura"}],"jpcoar:affiliationName":[{"@value":"Institute of Space and Astronautical Science Japan Aerospace Exploration Agency  Sagamihara Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730051","@type":"Researcher","foaf:name":[{"@value":"Shin‐ya Murakami"}],"jpcoar:affiliationName":[{"@value":"Institute of Space and Astronautical Science Japan Aerospace Exploration Agency  Sagamihara Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730049","@type":"Researcher","foaf:name":[{"@value":"Kazunori Ogohara"}],"jpcoar:affiliationName":[{"@value":"School of Engineering The University of Shiga Prefecture  Hikone Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518173730176","@type":"Researcher","foaf:name":[{"@value":"Takeshi Horinouchi"}],"jpcoar:affiliationName":[{"@value":"Faculty of Environmental Earth Science Hokkaido University  Sapporo 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":"2019-10","prism:volume":"124","prism:number":"10","prism:startingPage":"2635","prism:endingPage":"2659"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://creativecommons.org/licenses/by/4.0/"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2019JE006065"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2019JE006065"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2019JE006065"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JE006065"}],"createdAt":"2019-10-02","modifiedAt":"2023-09-08","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Earth%20and%20Planetary%20Astrophysics%20(astro-ph.EP)","dc:title":"Earth and Planetary Astrophysics (astro-ph.EP)"},{"@id":"https://cir.nii.ac.jp/all?q=450","dc:title":"450"},{"@id":"https://cir.nii.ac.jp/all?q=super-rotation","dc:title":"super-rotation"},{"@id":"https://cir.nii.ac.jp/all?q=FOS:%20Physical%20sciences","dc:title":"FOS: Physical sciences"},{"@id":"https://cir.nii.ac.jp/all?q=551","dc:title":"551"},{"@id":"https://cir.nii.ac.jp/all?q=Venus","dc:title":"Venus"},{"@id":"https://cir.nii.ac.jp/all?q=Kelvin%20wave","dc:title":"Kelvin wave"},{"@id":"https://cir.nii.ac.jp/all?q=Rossby%20wave","dc:title":"Rossby wave"},{"@id":"https://cir.nii.ac.jp/all?q=Akatsuki","dc:title":"Akatsuki"},{"@id":"https://cir.nii.ac.jp/all?q=UV%20features","dc:title":"UV features"},{"@id":"https://cir.nii.ac.jp/all?q=Astrophysics%20-%20Earth%20and%20Planetary%20Astrophysics","dc:title":"Astrophysics - Earth and Planetary Astrophysics"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781895916544","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"16H02225"},{"@type":"JGN","@value":"JP16H02225"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16H02225/"}],"notation":[{"@language":"ja","@value":"あかつき・地上観測と数値モデリングの連携による金星大気力学の研究"},{"@language":"en","@value":"Observational and numerical study on the Venus atmospheric dynamics"}]},{"@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"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256975019136","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"18K03726"},{"@type":"JGN","@value":"JP18K03726"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18K03726/"}],"notation":[{"@language":"ja","@value":"地球大気プラズマ結合過程の解明"},{"@language":"en","@value":"Study on the coupling process between neutral atmosphere and plasma"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256998846336","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19K14789"},{"@type":"JGN","@value":"JP19K14789"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19K14789/"}],"notation":[{"@language":"ja","@value":"スーパーローテーションの変動をもたらす金星成層圏での運動量輸送サイクルの解明"},{"@language":"en","@value":"Research for understanding atmospheric momentum cycle for variation of the super-rotation in the stratosphere of Venus"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050012570393345792","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Planetary-scale streak structure reproduced in high-resolution simulations of the Venus atmosphere with a low-stability layer"},{"@value":"Planetary-scale streak structure reproduced in a Venus atmospheric simulation"}]},{"@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/1050025031475140096","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"How waves and turbulence maintain the 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wind"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142938817280","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Studies in astronomical time series analysis. II - Statistical aspects of spectral analysis of unevenly spaced data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142939362816","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Vertical propagation of planetary-scale waves in variable background winds in the upper cloud region of Venus"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142939799424","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Global-Scale Waves in the Venus Atmosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142940167168","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Morphology of the cloud tops as observed by the Venus Express Monitoring Camera"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021389801975040","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Long‐Term Variability of Mean Winds and Planetary‐Scale Waves Around Venusian Cloud 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Comparison with Previous Measurements"}]},{"@id":"https://cir.nii.ac.jp/crid/1360571647804880640","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"New cloud morphologies discovered on the Venus's night during Akatsuki"}]},{"@id":"https://cir.nii.ac.jp/crid/1360571647804888832","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"A Long‐Lived Sharp Disruption on the Lower Clouds of Venus"}]},{"@id":"https://cir.nii.ac.jp/crid/1360571647804901120","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Brightness modulations of our nearest terrestrial planet Venus reveal atmospheric super-rotation rather than surface features"}]},{"@id":"https://cir.nii.ac.jp/crid/1360571968061637504","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Improved automatic estimation of winds at the cloud top of Venus using superposition of cross-correlation surfaces"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092884285312","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Voyager photometry of Europa"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092884457088","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Atmospheric structure and dynamics as the cause of ultraviolet markings in the clouds of Venus"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092886842112","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Influence of Venus topography on the zonal wind and UV albedo at cloud top level: The role of stationary gravity waves"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092888599040","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Least-squares frequency analysis of unequally spaced data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092889107712","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Algorithm 761: Scattered-data surface fitting that has the accuracy of a cubic polynomial"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092890301824","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Cloud level winds from the Venus Express Monitoring Camera imaging"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092890455936","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"VEGA 1 and VEGA 2 entry probes: An investigation of local UV absorption (220–400 nm) in the atmosphere of Venus (SO<sub>2</sub> aerosols, cloud 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