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Studies on acceleration processes of Iogenic gas and plasma based on stational observations at a suitable site for optical observations

Research Project

Project/Area Number 17403007
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Space and upper atmospheric physics
Research InstitutionTohoku University

Principal Investigator

MISAWA Hiroaki  Tohoku University, Graduate School of Science, Associate Professor (90219618)

Co-Investigator(Kenkyū-buntansha) OKANO Shoichi  Graduate School of Science, 大学院・理学研究科, Professor (10004483)
SAKANOI Takeshi  Graduate School of Science, 大学院・理学研究科, Research Associate (80271857)
TSUCHIYA Fuminori  Graduate School of Science, 大学院・理学研究科, Research Associate (10302077)
YAMAZAKI Atsushi  Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Research Associate (00374893)
SATOH Takehiko  Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Professor (10297632)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥9,100,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2005: ¥4,400,000 (Direct Cost: ¥4,400,000)
Keywordssatellite atmosphere / Io / plasma / acceleration process / remote sensing / optical observation / Jupiter / 国際情報交換
Research Abstract

The main purposes of this study are the followings: 1) How the gases originated from Jupiter's satellite Io, which are considered to be main plasma source of Jupiter's magnetosphere, are generated and released from Io, 2) how the Iogenic plasma is accelerated to nearly corotation speed, and 3) how the Iogenic plasma is thermalized from the cold state just after the gas is generated to the hot state as known from ground based observations and planetary explorers. In order to investigate them, regular optical observations for the Iogenic gas and plasma had been carried out about one month a year at Mt. Haleakara, Maui, Hawaii which is one of the best optical observation sites in the world. And, numerical simulations had been made for the three scientific subjects, respectively.
1. Results of the observations: 1) These is always an east-west asymmetry of the Iogenic sodium gas which is distributed beyond several tens Jovian radii (sodium nebula). 2) The plasma speed near Io's orbit is alwa … More ys slower than the corotation speed, and the speed shows magnetic longitude dependence and dawn-dusk asymmetry. 3) Plasma temperatures near Io's orbit is derived for the parallel and perpendicular directions with respect to Jupiter's local magnetic field.
2. Results of the numerical simulations: 1) The dominant release process of the Iogenic gas (sodium nebula) would be dissociation or dissociative recombination of the Iogenic plasma, and the amount of the released gas would be largest/smallest when Io is in the dawn/dusk sides. 2) A current circuit would be made between the plasma near the Io orbit and Jupiter's ionosphere which has longitudinal asymmetry in the conductivity due to the local time dependence of the solar UV irradiation, and quasi-uniform longitudinal currents would make the observed accelerated plasma flow which is slower than the corotation speed with the dawn-dusk asymmetry. 3) Iion-cyclotron waves would be generated in the just ionized Iogenic plasma due to a plasma instability induced by the "ring distribution", and the waves might make the observed thermal conditions by thermalizing the plasma through the wave-particle interaction (pitch angel scattering). Less

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (20 results)

All 2008 2007 2006 2005

All Journal Article (17 results) (of which Peer Reviewed: 3 results) Presentation (3 results)

  • [Journal Article] 木星磁気圏内でのピックアップイオンの熱化に関する計算機実験2008

    • Author(s)
      加藤雄人, 他
    • Journal Title

      東北大学情報シナジーセンター大規模科学計算システム広報SENAC 41・1

      Pages: 13-19

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Numerical simulation on thermali-zation process of pick-up ions in the Jovian magneto-sphere2008

    • Author(s)
      Yuto Kato et. al.
    • Journal Title

      SENAC (Report of Information Synergy Center Tohoku University) 41(1)

      Pages: 13-19

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] 木星磁気圏内でのピックアップイオンの熱化に関する計算機実験2008

    • Author(s)
      加藤雄人, 他
    • Journal Title

      東北大学情報シナジーセンター 大規模科学計算システム広報 SENAC 41(1)

      Pages: 13-19

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 木星ナトリウム雲の短期変動2008

    • Author(s)
      米田瑞生, 他
    • Journal Title

      東北大学惑星プラズマ・大気研究センター 惑星圏研究会集録 9(印刷中)

    • Related Report
      2007 Annual Research Report
  • [Journal Article] 木星H3+オーロラ観測と太陽風シミュレーションとの比較2008

    • Author(s)
      佐藤毅彦, 他
    • Journal Title

      東北大学惑星プラズマ・大気研究センター 惑星圏研究会集録 9(印刷中)

    • Related Report
      2007 Annual Research Report
  • [Journal Article] 木星周辺に観測されるイオ起源ナトリウム雲の東西非対称性2007

    • Author(s)
      米田瑞生, 他
    • Journal Title

      第8回惑星圏研究会集録

      Pages: 67-70

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] East-West asymmetry of Iogenic sodium nebula observed around Jupoter2007

    • Author(s)
      Mizuki Yoneda et. al.
    • Journal Title

      Proceedings of the 8th PPARC Planetosphere Symposium

      Pages: 67-70

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] イオ起源ナトリウム雲に見られる東西非対称性2007

    • Author(s)
      米田瑞生, 他
    • Journal Title

      東北大学惑星プラズマ・大気研究センター惑星圏研究会集録 8

      Pages: 67-70

    • Related Report
      2006 Annual Research Report
  • [Journal Article] イオプラズマトーラスにおける太陽風の効果2007

    • Author(s)
      野澤宏大, 他
    • Journal Title

      東北大学惑星プラズマ・大気研究センター惑星圏研究会集録 8

      Pages: 125-128

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Implication for the solar wind effect on the Io plasma torus2006

    • Author(s)
      Hiromasa Nozawa , et. al.
    • Journal Title

      Geophysical Research Letters 33・16

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Implication for the solar wind effect on the Io plasma torus2006

    • Author(s)
      Hiromasa Nozawa et. al.
    • Journal Title

      Geophysical Research Letters 33

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Implication for the solar wind effect on the Io plasma torus2006

    • Author(s)
      Hiromasa Nozawa, et. al.
    • Journal Title

      Geophysical Research Letters 33

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 高分散分光観測によるイオ起源ナトリウム原子の放出メカニズムとその変動2006

    • Author(s)
      青井 一紘, 他
    • Journal Title

      東北大学惑星プラズマ・大気研究センター惑星圏研究会集録 7

      Pages: 25-32

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 木星衛星イオ周辺ナトリウムコロナの分布2006

    • Author(s)
      鍵谷 将人
    • Journal Title

      Proc.38th ISAS Lunar Planet.Symp. 38(印刷中)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 木星衛星イオ起源ナトリウム原子の放出速度分布とその空間分布2006

    • Author(s)
      青井 一紘
    • Journal Title

      Proc.38th ISAS Lunar Planet.Symp. 38(印刷中)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Relationship between the Jovian magnetospheric plasma density and Io torus emission2005

    • Author(s)
      Hiromasa Nozawa
    • Journal Title

      Geophysical Research Letters 32・11

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Dynamic features of Io's extended sodium distributions2005

    • Author(s)
      Shin Takahashi
    • Journal Title

      Icarus 172・2

      Pages: 346-359

    • Related Report
      2005 Annual Research Report
  • [Presentation] 木星磁気圏におけるイオ起源の重イオンとイオンサイクロトロン波との相互作用について2007

    • Author(s)
      加藤雄人, 他
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      幕張メッセ、幕張、日本
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Wave-particle interaction between ion cyclotron waves and Iogenic ions in the Jovian magnetosphere2007

    • Author(s)
      Yuto Kato ed. al.
    • Organizer
      Japan Geoscience Union Meeting 2007
    • Place of Presentation
      Makuhari Messe, Makuhari, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Observation of Sulfur Ion Emissions in Io Plasma Toms: Decreasing Emission Intensities of[SII]and Neutral Sodium Cloud2007

    • Author(s)
      M. Kagitani
    • Organizer
      39th AAS Division for Planetary Sciences Meeting
    • Place of Presentation
      米国・フロリダ
    • Related Report
      2007 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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