Japan Geoscience Union Meeting 2023

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[E] Oral

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS04] Advancing the science of Venus in the golden age of exploration

Wed. May 24, 2023 10:45 AM - 12:00 PM Exhibition Hall Special Setting (3) (Exhibition Hall 8, Makuhari Messe)

convener:Takehiko Satoh(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), George HASHIMOTO(Department of Earth Sciences, Okayama University), Moa Persson(Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan), Kevin McGouldrick(University of Colorado Boulder), Chairperson:Takehiko Satoh(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Takeshi Imamura(Graduate School of Frontier Sciences, The University of Tokyo)



11:00 AM - 11:15 AM

[PPS04-12] Long-term variations of mean winds and planetary-scale waves at the cloud top of Venus observed with Akatsuki/UVI

*Takeshi Horinouchi1, Toru Kouyama2, Masataka Imai3, Atsushi Yamazaki4, Takehiko Satoh4 (1.Faculty of Environmental Earth Science, Hokkaido University, 2.AIST, 3.Kyoto Sangyo University, 4.JAXA/ISAS)

Keywords:Venus, Wind, Wave

Akasuki has been in operation since its orbital insertion in Dec 2015, and UVI onboard Akatsuki has been nearly continuously observing dayside UV radiance from around the cloud top. Horinouchi et al (2018) documented the mean winds and their variations obtained over the first ~1.5 years. Here, we update the study with the observation up to 2022, and we further report long-term statistics of planetary-scale waves, updating the case study of Imai et al (2019). The topics include hemispheric asymmetry and its variability, long-term and low-frequency variations of the superrotation, thermal tides, and statistics of the Rossby and the equatorial Kelvin waves.