Imamura, Takeshi, Ando, Hiroki, Tellmann, Silvia, Paetzold, Martin, Haeusler, Bernd, Yamazaki, Atsushi, Sato, Takao M., Noguchi, Katsuyuki, Futaana, Yoshifumi, Oschlisniok, Janusz, Limaye, Sanjay, Choudhary, R. K., Murata, Yasuhiro, Takeuchi, Hiroshi ORCID: 0000-0001-5863-4653, Hirose, Chikako, Ichikawa, Tsutomu, Toda, Tomoaki, Tomiki, Atsushi, Abe, Takumi, Yamamoto, Zen-ichi, Noda, Hirotomo, Iwata, Takahiro, Murakami, Shin-ya ORCID: 0000-0002-7137-4849, Satoh, Takehiko ORCID: 0000-0001-9071-5808, Fukuhara, Tetsuya, Ogohara, Kazunori ORCID: 0000-0001-7666-4442, Sugiyama, Ko-ichiro, Kashimura, Hiroki ORCID: 0000-0001-7130-6953, Ohtsuki, Shoko, Takagi, Seiko, Yamamoto, Yukio, Hirata, Naru, Hashimoto, George L., Yamada, Manabu, Suzuki, Makoto, Ishii, Nobuaki, Hayashiyama, Tomoko, Lee, Yeon Joo ORCID: 0000-0002-4571-0669 and Nakamura, Masato (2017). Initial performance of the radio occultation experiment in the Venus orbiter mission Akatsuki. Earth Planets Space, 69. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1880-5981

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Abstract

After the arrival of Akatsuki spacecraft of Japan Aerospace Exploration Agency at Venus in December 2015, the radio occultation experiment, termed RS (Radio Science), obtained 19 vertical profiles of the Venusian atmosphere by April 2017. An onboard ultra-stable oscillator is used to generate stable X-band downlink signals needed for the experiment. The quantities to be retrieved are the atmospheric pressure, the temperature, the sulfuric acid vapor mixing ratio, and the electron density. Temperature profiles were successfully obtained down to similar to 38 km altitude and show distinct atmospheric structures depending on the altitude. The overall structure is close to the previous observations, suggesting a remarkable stability of the thermal structure. Local time-dependent features are seen within and above the clouds, which is located around 48-70 km altitude. The H2SO4 vapor density roughly follows the saturation curve at cloud heights, suggesting equilibrium with cloud particles. The ionospheric electron density profiles are also successfully retrieved, showing distinct local time dependence. Akatsuki RS mainly probes the low and middle latitude regions thanks to the near-equatorial orbit in contrast to the previous radio occultation experiments using polar orbiters. Studies based on combined analyses of RS and optical imaging data are ongoing.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Imamura, TakeshiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, HirokiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tellmann, SilviaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haeusler, BerndUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yamazaki, AtsushiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sato, Takao M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Noguchi, KatsuyukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Futaana, YoshifumiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oschlisniok, JanuszUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Limaye, SanjayUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choudhary, R. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murata, YasuhiroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takeuchi, HiroshiUNSPECIFIEDorcid.org/0000-0001-5863-4653UNSPECIFIED
Hirose, ChikakoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ichikawa, TsutomuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Toda, TomoakiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tomiki, AtsushiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Abe, TakumiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yamamoto, Zen-ichiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Noda, HirotomoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Iwata, TakahiroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murakami, Shin-yaUNSPECIFIEDorcid.org/0000-0002-7137-4849UNSPECIFIED
Satoh, TakehikoUNSPECIFIEDorcid.org/0000-0001-9071-5808UNSPECIFIED
Fukuhara, TetsuyaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ogohara, KazunoriUNSPECIFIEDorcid.org/0000-0001-7666-4442UNSPECIFIED
Sugiyama, Ko-ichiroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kashimura, HirokiUNSPECIFIEDorcid.org/0000-0001-7130-6953UNSPECIFIED
Ohtsuki, ShokoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takagi, SeikoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yamamoto, YukioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirata, NaruUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hashimoto, George L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yamada, ManabuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suzuki, MakotoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ishii, NobuakiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hayashiyama, TomokoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, Yeon JooUNSPECIFIEDorcid.org/0000-0002-4571-0669UNSPECIFIED
Nakamura, MasatoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-214567
DOI: 10.1186/s40623-017-0722-3
Journal or Publication Title: Earth Planets Space
Volume: 69
Date: 2017
Publisher: SPRINGER HEIDELBERG
Place of Publication: HEIDELBERG
ISSN: 1880-5981
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PIONEER-VENUS; SCIENCE EXPERIMENT; MIDDLE ATMOSPHERE; THERMAL STRUCTURE; DENSITY PROFILES; EXPERIMENT VERA; SULFURIC-ACID; EXPRESS; IONOSPHERE; CLOUDMultiple languages
Geosciences, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/21456

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