Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki

Takehiko Kitahara; Takeshi Imamura; Takao M. Sato; Atsushi Yamazaki; Yeon Joo Lee; Manabu Yamada; Shigeto Watanabe; Makoto Taguchi; Tetsuya Fukuhara; Toru Kouyama; Shin ya Murakami; George L. Hashimoto; Kazunori Ogohara; Hiroki Kashimura; Takeshi Horinouchi; Masahiro Takagi

doi:10.1029/2018JE005842

Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki

Takehiko Kitahara, Takeshi Imamura, Takao M. Sato, Atsushi Yamazaki, Yeon Joo Lee, Manabu Yamada, Shigeto Watanabe, Makoto Taguchi, Tetsuya Fukuhara, Toru Kouyama, Shin ya Murakami, George L. Hashimoto, Kazunori Ogohara, Hiroki Kashimura, Takeshi Horinouchi, Masahiro Takagi

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Stationary features indicative of topographic gravity waves were identified at the cloud top of Venus with the 283-nm channel of the Ultraviolet Imager (UVI) onboard Akatsuki, and their geographical and local time dependences were studied. At this wavelength the absorption by SO₂ dominates. To extract stationary structures with respect to the surface, we averaged multiple images to smooth out moving features and applied high-pass filtering to emphasize small structures. We found that stationary features appear exclusively above highlands and that they tend to appear between noon and evening. The stationary features seem to be synchronized with those observed in the cloud top temperature maps taken by the Longwave Infrared Camera (LIR). It was shown using a gravity wave model that the scale height of SO₂ should be smaller than that of the cloud around the cloud top to reproduce the observed phase relationship between the stationary features seen in the Ultraviolet Imager and Longwave Infrared Camera images.

Original language	English
Pages (from-to)	1266-1281
Number of pages	16
Journal	Journal of Geophysical Research: Planets
Volume	124
Issue number	5
DOIs	https://doi.org/10.1029/2018JE005842
Publication status	Published - May 2019

Keywords

Akatsuki
Venus
cloud
gravity wave
sulfur dioxide

ASJC Scopus subject areas

Geochemistry and Petrology
Geophysics
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1029/2018JE005842

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Kitahara, T., Imamura, T., Sato, T. M., Yamazaki, A., Lee, Y. J., Yamada, M., Watanabe, S., Taguchi, M., Fukuhara, T., Kouyama, T., Murakami, S. Y., Hashimoto, G. L., Ogohara, K., Kashimura, H., Horinouchi, T., & Takagi, M. (2019). Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki. Journal of Geophysical Research: Planets, 124(5), 1266-1281. https://doi.org/10.1029/2018JE005842

Kitahara, T, Imamura, T, Sato, TM, Yamazaki, A, Lee, YJ, Yamada, M, Watanabe, S, Taguchi, M, Fukuhara, T, Kouyama, T, Murakami, SY, Hashimoto, GL, Ogohara, K, Kashimura, H, Horinouchi, T & Takagi, M 2019, 'Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki', Journal of Geophysical Research: Planets, vol. 124, no. 5, pp. 1266-1281. https://doi.org/10.1029/2018JE005842

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title = "Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki",

abstract = "Stationary features indicative of topographic gravity waves were identified at the cloud top of Venus with the 283-nm channel of the Ultraviolet Imager (UVI) onboard Akatsuki, and their geographical and local time dependences were studied. At this wavelength the absorption by SO2 dominates. To extract stationary structures with respect to the surface, we averaged multiple images to smooth out moving features and applied high-pass filtering to emphasize small structures. We found that stationary features appear exclusively above highlands and that they tend to appear between noon and evening. The stationary features seem to be synchronized with those observed in the cloud top temperature maps taken by the Longwave Infrared Camera (LIR). It was shown using a gravity wave model that the scale height of SO2 should be smaller than that of the cloud around the cloud top to reproduce the observed phase relationship between the stationary features seen in the Ultraviolet Imager and Longwave Infrared Camera images.",

keywords = "Akatsuki, Venus, cloud, gravity wave, sulfur dioxide",

author = "Takehiko Kitahara and Takeshi Imamura and Sato, {Takao M.} and Atsushi Yamazaki and Lee, {Yeon Joo} and Manabu Yamada and Shigeto Watanabe and Makoto Taguchi and Tetsuya Fukuhara and Toru Kouyama and Murakami, {Shin ya} and Hashimoto, {George L.} and Kazunori Ogohara and Hiroki Kashimura and Takeshi Horinouchi and Masahiro Takagi",

note = "Funding Information: We acknowledge the Akatsuki project team for supporting the observations. The data used are available at JAXA's data archive (https://darts.jaxa.jp/planet/project/akatsuki). The two anonymous reviewers provided valuable comments. Publisher Copyright: {\textcopyright} 2019. The Authors.",

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doi = "10.1029/2018JE005842",

language = "English",

volume = "124",

pages = "1266--1281",

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AU - Kitahara, Takehiko

AU - Imamura, Takeshi

AU - Sato, Takao M.

AU - Yamazaki, Atsushi

AU - Lee, Yeon Joo

AU - Yamada, Manabu

AU - Watanabe, Shigeto

AU - Taguchi, Makoto

AU - Fukuhara, Tetsuya

AU - Kouyama, Toru

AU - Murakami, Shin ya

AU - Hashimoto, George L.

AU - Ogohara, Kazunori

AU - Kashimura, Hiroki

AU - Horinouchi, Takeshi

AU - Takagi, Masahiro

N1 - Funding Information: We acknowledge the Akatsuki project team for supporting the observations. The data used are available at JAXA's data archive (https://darts.jaxa.jp/planet/project/akatsuki). The two anonymous reviewers provided valuable comments. Publisher Copyright: © 2019. The Authors.

PY - 2019/5

Y1 - 2019/5

N2 - Stationary features indicative of topographic gravity waves were identified at the cloud top of Venus with the 283-nm channel of the Ultraviolet Imager (UVI) onboard Akatsuki, and their geographical and local time dependences were studied. At this wavelength the absorption by SO2 dominates. To extract stationary structures with respect to the surface, we averaged multiple images to smooth out moving features and applied high-pass filtering to emphasize small structures. We found that stationary features appear exclusively above highlands and that they tend to appear between noon and evening. The stationary features seem to be synchronized with those observed in the cloud top temperature maps taken by the Longwave Infrared Camera (LIR). It was shown using a gravity wave model that the scale height of SO2 should be smaller than that of the cloud around the cloud top to reproduce the observed phase relationship between the stationary features seen in the Ultraviolet Imager and Longwave Infrared Camera images.

AB - Stationary features indicative of topographic gravity waves were identified at the cloud top of Venus with the 283-nm channel of the Ultraviolet Imager (UVI) onboard Akatsuki, and their geographical and local time dependences were studied. At this wavelength the absorption by SO2 dominates. To extract stationary structures with respect to the surface, we averaged multiple images to smooth out moving features and applied high-pass filtering to emphasize small structures. We found that stationary features appear exclusively above highlands and that they tend to appear between noon and evening. The stationary features seem to be synchronized with those observed in the cloud top temperature maps taken by the Longwave Infrared Camera (LIR). It was shown using a gravity wave model that the scale height of SO2 should be smaller than that of the cloud around the cloud top to reproduce the observed phase relationship between the stationary features seen in the Ultraviolet Imager and Longwave Infrared Camera images.

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KW - sulfur dioxide

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Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki

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Keywords

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