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小郷原 一智 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 准教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2017/10 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Initial performance of the radio occultation experiment in the Venus orbiter mission Akatsuki |
| 執筆形態 | その他 |
| 掲載誌名 | EARTH PLANETS AND SPACE |
| 出版社・発行元 | SPRINGER HEIDELBERG |
| 巻・号・頁 | 69(1) |
| 著者・共著者 | Takeshi Imamura,Hiroki Ando,Silvia Tellmann,Martin Paetzold,Bernd Haeusler,Atsushi Yamazaki,Takao M. Sato,Katsuyuki Noguchi,Yoshifumi Futaana,Janusz Oschlisniok,Sanjay Limaye,R. K. Choudhary,Yasuhiro Murata,Hiroshi Takeuchi,Chikako Hirose,Tsutomu Ichikawa,Tomoaki Toda,Atsushi Tomiki,Takumi Abe,Zen-ichi Yamamoto,Hirotomo Noda,Takahiro Iwata,Shin-ya Murakami,Takehiko Satoh,Tetsuya Fukuhara,Kazunori Ogohara,Ko-ichiro Sugiyama,Hiroki Kashimura,Shoko Ohtsuki,Seiko Takagi,Yukio Yamamoto,Naru Hirata,George L. Hashimoto,Manabu Yamada,Makoto Suzuki,Nobuaki Ishii,Tomoko Hayashiyama,Yeon Joo Lee,Masato Nakamura |
| 概要 | 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. |
| DOI | 10.1186/s40623-017-0722-3 |
| ISSN | 1880-5981 |
| Put Code(ORCID) | 52343325 |
| PermalinkURL | http://www.scopus.com/inward/record.url?eid=2-s2.0-85030859674&partnerID=MN8TOARS |
| researchmap用URL | http://orcid.org/0000-0001-7666-4442 |