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Study of Mechanism of MHD dynamo-Toward Understanding of Geodynamo-

Research Project

Project/Area Number 07640532
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionNational Institute for Fusion Science

Principal Investigator

KIDA Shigeo  National Institute for Fusion Science, Theory and Computer Simulation Center, Professor, 理論・シミュレーション研究センター, 教授 (70093234)

Co-Investigator(Kenkyū-buntansha) MIURA Hideaki  National Institute for Fusion Science, Theory and Computer Simulation Center, As, 理論・シミュレーション研究センター, 助手 (40280599)
TANAKA Mitsuru  Kyoto Institute of Technology Department of Mechanical and System Engineering, A, 工芸学部, 助手 (20281115)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsDynamo / Thermal convection
Research Abstract

The mechanism of generation and sustenance of magnetic field driven thermally in a rotating spherical shell was investigated numerically as one of the simplest models of geody-namo. During the period of the project we obtained the following interesting results. [1] It is the first time in the world that the generation of a strong magnetic field and a quasi-periodic oscillation of magnetic dipole are realized on a computer by solving the MHD equations with-out any simplification. [2] The full three-dimensional structure of the thermal convection which creates the magnetic field was clarified by a detailed analysis of closed streamlines and stagnation points. The relation between the spatial structures of the velocity and the magnetic field is currently being investigated in terms of these streamlines as well as by the eigen-value analysis of the velocity-gradient tensor. [3] It was found that there is a complicated but regular time-variation in both the magnetic and the velocity fields which cause the above-mentioned quasi-periodic reversal of the magnetic dipole moment. [4] A kinematic MHD simulation was performed to reveal that there is a strong spatial correlation between the velocity and the magnetic fields.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 北内英章: "Flow structure of thermal convection in a rotating spherical shell" 核融合科学研究所研究紀要. 426. 1-41 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 荒木圭典: "回転球殻熱対流ダイナモ-流れ構造と磁場生成の関係-" 京都大学数理解析研究所講究録. 970. 54-63 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 北内英章: "Flow Structure of Thermal Convection in a Rotating Spherical Shell" Nonlinearity. (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 木田重雄: "Periodic reversals of magnetic field generated by thermal convection in a rotating spherical shell" Journal of Physical Society of Japan. (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kitauchi, K.Araki and S.Kida: "Flow structure of thermal convection in a rotating spherical shell" NIFS-Rep. 426. 1-41 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Araki, H.Kitauchi and S.Kida: "Thermally driven dynamo in a rotating sphericl shell-Relation between the flow structure and the magnetic field generation." RIMS Kokyuroku. 970. 54-63 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kitachi, K.Araki and S.Kida: "Flow Structure of Thermal Convection in a Rotating Spherical Shell." Nonlinearity. (in print). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Kida, K.Araki and H.Kitauchi: "Periodic reversals of magnetic field generated by thermal convection in a rotating spherical shell." J.Phy.Soc.Japan. (in print). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 北内英章: "Flow structure of thermal convection in a rotating spherical shell" 核融合科学研究所研究紀要. 426. 1-41 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 荒木圭典: "回転球殻熱対流ダイナモ-流れ構造と磁場生成の関係-" 京都大学数理解析研究所講究録. 970. 54-63 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 北内英章: "Flow Structure of Thermal Convection in a Rotating Spherical Shell" Nonlinearity. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 木田重雄: "Periodic reversal of magnetic field generated by thermal convection in a rotating spherical shell" Journal of Physical Society of Japan. (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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