日本地球惑星科学連合2018年大会

講演情報

[EE] Evening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] Outer Solar System Exploration Today, and Tomorrow

2018年5月21日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:木村 淳(大阪大学)、笠羽 康正(東北大学大学院 理学研究科 地球物理学専攻)、Vance Steven(Jet Propulsion Laboratory, Caltech、共同)、Kunio M. Sayanagi (Hampton University)

[PPS01-P03] Evolution of Icy Moon's Interior Uncovered by Laboratory Experiment: Modeling of Space Weather by Ion Irradiation

*木村 智樹1仲内 悠祐2木村 淳3鈴木 耕拓4中田 吉則4玉川 徹5早藤 麻美5中野 俊男5村上 豪6吉岡 和夫7 (1.東北大学学際科学フロンティア研究所、2.会津大学宇宙情報科学クラスター、3.大阪大学理学研究科、4.若狭湾エネルギー研究センター、5.理化学研究所仁科加速器研究センター、6.JAXA宇宙科学研究所、7.東京大学大学院新領域創成科学研究科)

キーワード:氷天体、地下海、プラズマ

In our solar system, several icy bodies have possibility for a liquid water ocean underneath a solid ice shell, while only Earth has ocean on the surface. The subsurface ocean could be potentially universal habitable environment. Duration of the subsurface ocean is an unsolved big problem for evolution of the icy body's interior and also for the possible life that has likely been evolving there. We uncover the evolutions of subsurface ocean based on the space weathering on solid surface that is driven by irradiation of energetic plasma around planets. Long-term space weathering at Ganymede that reaches Giga years is modeled by plasma irradiation to surface materials with laboratory beam experiment. Chronology for Ganymede's magnetic field excited by molten metallic core can be suggested based on a dependence of the space weathering on the Ganymede's magnetic field strength. We are going to pin down the subsurface ocean evolution from the magnetic field chronology. In this presentation, we report current status of our laboratory experiment made with an ion injector at Wakasa-wan Energy Research Center.