Topographical and Local Time Dependence of Large Stationary Gravity Waves Observed at the Cloud Top of Venus

T. Kouyama, T. Imamura, M. Taguchi, T. Fukuhara, T. M. Sato, A. Yamazaki, M. Futaguchi, S. Murakami, G. L. Hashimoto, M. Ueno, N. Iwagami, S. Takagi, M. Takagi, K. Ogohara, H. Kashimura, T. Horinouchi, N. Sato, M. Yamada, Y. Yamamoto, S. OhtsukiK. Sugiyama, H. Ando, M. Takamura, T. Yamada, T. Satoh, M. Nakamura

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

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 of the waves tended to slowly drift eastward over their lifetimes. The appearances of stationary waves depend not only on surface topography but also on latitude and local time, suggesting that solar heating during the daytime and atmospheric structure affected by solar heating may control the excitation and propagation of stationary waves.

Original languageEnglish
Pages (from-to)12,098-12,105
JournalGeophysical Research Letters
Volume44
Issue number24
DOIs
Publication statusPublished - Dec 28 2017

Keywords

  • Akatsuki
  • Venus
  • atmosphere
  • stationary waves
  • thermal infrared

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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