2017
DOI: 10.1002/2017gl075792
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Topographical and Local Time Dependence of Large Stationary Gravity Waves Observed at the Cloud Top of Venus

Abstract: The existence of large stationary gravity waves was discovered during Akatsuki's first observation sequence in 2015. In this study, the further detection of large stationary gravity waves in brightness temperature images over a 1.5 year period is reported. The waves periodically appeared mostly above four specific highland regions in the low latitudes when these regions were in the local afternoon. The wave amplitudes attenuated after the wave locations passed beyond the evening terminator, and the locations o… Show more

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Cited by 55 publications
(56 citation statements)
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“…All of the stationary features show streaky structures extending in the north‐south direction and tend to show wavelike patterns of up to one cycle in the east‐west direction. This feature is similar to the ones observed by LIR (Kouyama et al, ) and seen in the model result shown in Fukuhara, Futaguchi, et al (). The zonal span of the stationary features is 300–500 km, while the meridional span is up to 2,000–3,000 km, beyond which the bow‐shaped structures are difficult to separate from background fluctuations.…”
Section: Characteristics Of Stationary Featuressupporting
confidence: 91%
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“…All of the stationary features show streaky structures extending in the north‐south direction and tend to show wavelike patterns of up to one cycle in the east‐west direction. This feature is similar to the ones observed by LIR (Kouyama et al, ) and seen in the model result shown in Fukuhara, Futaguchi, et al (). The zonal span of the stationary features is 300–500 km, while the meridional span is up to 2,000–3,000 km, beyond which the bow‐shaped structures are difficult to separate from background fluctuations.…”
Section: Characteristics Of Stationary Featuressupporting
confidence: 91%
“…In the images taken immediately after the Venus orbit insertion, huge bow‐shaped structures extending from northern to southern high latitudes were discovered by the Longwave Infrared Camera (LIR; Fukuhara et al, ) and Ultraviolet Imager (UVI; Yamazaki et al, ) onboard Akatsuki, and they continued to exist for more than four Earth days at the cloud top (Fukuhara, Futaguchi, et al, ). Similar features have been observed several times by LIR (Kouyama et al, ). Since they appear above certain highlands and are always present there, they can be attributed to topographic gravity waves.…”
Section: Introductionsupporting
confidence: 88%
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“…As noted above, Bertaux et al () found a correlation of the zonal wind field derived from the VMC UV images with the surface topography. Kouyama et al () reported observations of the planetary bow‐shaped feature by the LIR camera onboard Akatsuki in the thermal IR range. This signature is hemispherically symmetric and often appears in the afternoon above Aphrodite Terra, Thesis Regio, Atla Regio, and Beta Regio.…”
Section: Discussionmentioning
confidence: 99%
“…The feature was meridionally oriented, hemispherically symmetric, and locked to the great highlands on the Venus surface such as Aphrodite Terra, Thesis Regio, Atla Regio, and Beta Regio. Kouyama et al () found that appearance of the wave depended not only on surface topography but also on latitude and local time.…”
Section: Introductionmentioning
confidence: 99%