日本地球惑星科学連合2014年大会

講演情報

インターナショナルセッション(ポスター発表)

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS01_30PO1] Toward JUICE and future explorations of outer solar system

2014年4月30日(水) 18:15 〜 19:30 3階ポスター会場 (3F)

コンビーナ:*木村 淳(東京工業大学地球生命研究所)、谷川 享行(北海道大学低温科学研究所)、佐々木 晶(大阪大学大学院理学研究科宇宙地球科学専攻)、藤本 正樹(宇宙航空研究開発機構・宇宙科学研究本部)、笠羽 康正(東北大学大学院 理学研究科 地球物理学専攻)、関根 康人(東京大学大学院新領域創成科学研究科複雑理工学専攻)

18:15 〜 19:30

[PPS01-P01] 木星圏探査機JUICE搭載サブミリ波放射計SWIの開発

*佐川 英夫1笠井 康子1菊池 健一1西堀 俊幸2真鍋 武嗣3落合 啓1黒田 剛史4関根 康人5Hartogh Paul6 (1.情報通信研究機構、2.宇宙航空開発研究機構、3.大阪府立大学、4.東北大学、5.東京大学、6.マックスプランク研究所 太陽系研究部門)

キーワード:木星, 氷衛星, JUICE, サブミリ波, リモートセンシング, 測器開発

The Submillimetre-Wave Instrument (SWI) is a passive submillimeter-wave heterodyne instrument proposed as one of the scientific payload instruments for the Jupiter Icy Moons Explorer (JUICE) mission. It measures the thermal emission from atmosphere of Jupiter and its moons at the frequency region of 500 - 600 GHz (with keeping 1200 GHz range as an optional concept). Thermal emission from the surface of moons will also be measured. JUICE/SWI provides unique observational data for characterization of the Jovian stratosphere such as thermal structure, dynamics, and distribution of minor species; and for exploration of tenuous-atmosphere and surface environment of the Jovian moons. By detecting hydrogen and oxygen isotopes in the water vapor of Jovian moons' atmosphere, SWI can also contribute to understanding the origin and distribution of water in our solar system.
This paper presents the current status of the development of SWI instrument, including the updates on the science targets and their feasibility studies. The SWI instrument is being developed through international cooperation. The Japanese team contributes to the development of the submillimeter reflector (mirror). The submillimeter reflector is one of the key components of SWI, and it determines the spatial resolution of observations. Currently a 30-cm aperture diameter reflector is considered, providing a spatial resolution of 2 mrad (FWHM) at 600 GHz. In order to fulfill the stringent requirement of weight reduction, we evaluated the material of the reflector and optimized its rib structure. The side lobe suppression is also an important factor to improve the quality of observations.