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--> Frontier Research Institute for Interdisciplinary SciencesTohoku University Directions 日本語 English CONTACT 日本語 English About FRISGreetingsOverviewMissionsOrganizationTenure track system in FRISMaps & DirectionsPublicationAnnual MeetingAbstract for Annual MeetingConsultation DeskResearcherAdvanced Interdisciplinary Research DivisionHiroshi MasumotoTakehito ShimatsuTakashi ItohKenji TomaShinsuke NiwaTakaaki TomaiCreative Interdisciplinary Research DivisionYuanyuan GuoMasaki OkumuraNguyen Tuan HungHiroshi UenoToshiharu IchinoseYuta KudoHiroya AbeYuta NakayasuNaoya KitajimaDaniel Pastor-GalanYasunori OkamotoTakuro IshiiMasaki YamadaYuta YamaneKexin XiongKohei ShimokawaShinichi SatoKotaro YasuiSUN SaiYuji SaitoAtsushi TaharaKyoko ChibaYuka HatanoHakuto SuzukiKaoru HiramotoHideaki T. MatsubayashiAseel Mahmoud Suleiman MarahlehSakura KiuchiShigeo S. KimuraBin Ho LeTom WellingHiroyuki UechiFumi MurakoshiChao TangTakahiro ChibaIzumi MatsudairaYuka FujikiLinda ZhangYueh Hsuan WengManaging & Planning DivisionJunji SaidaHideaki FujiwaraEndowed Research DivisionsSenior-advisorTomoyuki YamayaVisiting Professors / Collaborative ResearchersSpecially-appointedOne-time membersSeiji KojimaDaisuke SuzukiHidenobu YajimaHirokazu KawamuraShozo FurumotoKanako ShojikiYiwen ZhangYuiko Morita-FujimuraPierre Antoine GESLINYuma TakahashiTatsuya SatoYuki FuruseKim Sung HoonYui ArimatsuYuichiro FujiokaRui NouchiAyako NakamuraNozomi SaitoTetsuya KajitaHiroyasu HatakeyamaYuki ShibazakiSohei TasakiHitomi AnzaiYuji ShimogonyaHideaki YamamotoHiroki TakikawaTakeshi InoueTakashi MisakaMikito TanakaGao JunhongNaoya OnizawaYasufumi ArakiDaisuke SaitoShusaku SugimotoMasafumi NakayamaHirofumi NodaMasanori IzumiMichiko KanoKohji TsumuraKenichi FunamotoMasahiro KayamaAtsushi NarukoShinsuke SuzukiGen HayaseDaisuke YoshinoTakashi ShimonishiHisashi InoueTakayuki KojimaNobuyuki MatsumotoSeiji KamadaSae KanekoTomoki KimuraYuichiro NakajimaShimpei EndoRui YamadaHisashi KinoYuki Suzuki Fumihiro KanedaYuji NashimotoYusuke SatoShuhei ObaraYasukazu DaigakuHanae AokiHiroki IdaAlimu TuohetiKaoru KakinumaJoji KusuyamaJiuhui HanYang CaoJun ZhangKohei TamuraChaoliang ZhangTomokatsu OnagaMasanori WakizakaKohei IchikawaTomomi TsunematsuChrystelle BERNARDKozue ShiomiYohei KawazuraSatoshi IihamaTakuya MabuchiFeatureTopicsFRIS InterviewsFRIS Interviews #01FRIS Interviews #02FRIS Interviews #03FRIS Interviews #04FRIS Interviews #05FRIS Interviews #06FRIS Interviews #07FRIS Interviews #08FRIS Interviews #09FRIS Interviews #10FRIS Interviews #11FRIS Interviews #12FRIS Interviews #13FRIS Interviews #14FRIS Interviews #15FRIS Interviews #16FRIS Hub MeetingFRIS Hub Meeting 2024FRIS Hub Meeting 2023FRIS Hub Meeting2022FRIS Hub Meeting2021FRIS Hub Meeting archiveProgramsOpen Research ProposalResearch ProjectsRecruitOpen Staff PositionsFRIS Regulations pertaining to the tenure track systemHandbook for International ResearchersFRIS FundFRIS Fund for Early-Career Independent ResearchersLINK Researcher HOME en Researcher One-time members Tomoki Kimura ResearcherAdvanced Interdisciplinary Research DivisionCreative Interdisciplinary Research DivisionManaging & Planning DivisionEndowed Research DivisionsSenior-advisorVisiting Professors / Collaborative ResearchersSpecially-appointedOne-time members Tenure in FRIS 2018.4-2020.3 Tomoki Kimura Assistant ProfessorAdvanced Basic Science Mentor Information Professor Takahiro Obara (Graduate School of Science) Tohoku Univ.Database--> Homepage Research Fields Planetary physics: dynamics and evolution of planetary interior, surface, atmosphere, and space. Research Subjects Evolution of subsurface ocean at icy bodies in our solar system Plasma acceleration at magnetized rotating bodies Planetary exploration Academic Society Membership Society of Geomagnetism and Earth, Planetary and Space Sciences, American Geophysical Union, The Japanese Society for Planetary Sciences, Japanese Geoscience Union Research Outline   Our final goal is to universally understand creation and evolution of habitable environments in the space and atmosphere surrounding planets. Our current scope is the icy bodies in our solar system, at which liquid water ‘subsurface ocean’ is confirmed underneath solid icy surface. The extra-terrestrial life like deep sea creatures at Earth potentially exists in the subsurface ocean. In 2030s, we are going to explore space and surface environments at Jupiter’s icy moons ‘Ganymede’ and ‘Europa’ based on highly precise ‘in-situ’ measurement with spacecraft developed in international collaboration with JAXA and ESA. Creation and evolution of the subsurface ocean will be uncovered by our laboratory experiment for the icy body’s space environment in comparison with the in-situ spacecraft observation. The key for our goal is the space plasma surrounding the icy body. The space plasma is accelerated by electromagnetic energy deposited in intrinsic magnetic field and rotation of planet. The energetic plasma irradiates materials of the icy body’s surface. Chemical and physical alterations on the surface materials are driven by the irradiation, which is referred to as the ‘space weathering’. The space weathering slowly progresses on timescales up to 100s Mega years. The icy body also has the intrinsic magnetic field that is generate by fluid dynamics in the interior. The icy body magnetic field reflects the space plasma, leading to dependence of the space weathering on magnetic field strength on the surface. Based on laboratory experiment for the space weathering in comparison with the spacecraft exploration, we estimate the age of magnetic field that constrains differentiation of the icy body interior including development and evolution of the subsurface ocean. 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