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Verification of the geomagnetic secular variation models based on laboratory experiments and numerical simulations.

Research Project

Project/Area Number 15204038
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionUniversity of Tokyo

Principal Investigator

HAMANO Yozo  University of Tokyo, Graduate school of Science, Professor, 大学院・理学系研究科, 教授 (90011709)

Co-Investigator(Kenkyū-buntansha) TAKEDA Yasushi  Hokkaido University, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (90108481)
SUMITA Ikuro  Kanazawa University, Graduate School of Natural Science, Assoc.Professor, 大学院・自然科学研究科, 助教授 (90334747)
SAKURADA Ataru  University of Tokyo, Graduate School of Science, Res.Associate, 大学院・理学系研究科, 助手 (50345261)
YANAGISAWA Takatoshi  JAMSTEC, Inst.for Frontier Research of Earth Evolution, 地球内部変動研究センター, 研究員 (20359186)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥48,880,000 (Direct Cost: ¥37,600,000、Indirect Cost: ¥11,280,000)
Fiscal Year 2005: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2004: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2003: ¥26,000,000 (Direct Cost: ¥20,000,000、Indirect Cost: ¥6,000,000)
KeywordsEarth's core / dynamo action / Geomagnetism / liquid metal / thermal convection / turbulence / geomagnetic field / paleomagnetism / 地球磁場変動 / 室内実験 / 熱対流運動 / 超音波流速測定法 / コア / 古地磁気
Research Abstract

Purpose of the present research is to verify several models for the geomagnetic secular variations based on laboratory experiments and the numerical simulations. This project consists of (1)observation of the variations of the geomagnetic fields in various time scales, (2)laboratory experiments on the turbulent properties of thermal convection in liquid metal, and (3)numerical simulations of generation of the magnetic field in a conducting fluid shell. (1)In the geomagnetic field observations, paleomagnetic studies on the historical lava flows from Izu-Oshima volcano and Mt.Fuji, and the lake sediments from Nakaumi, Japan and Lake Qarun, Egypt, were performed and the geomagnetic secular variations during the past several thousand years were estimated. (2)In the laboratory experiments, a new apparatus was developed for observing fluid motions in liquid metal layer by using the ultrasonic velocimetry technique. Observations of turbulent convective motions in liquid Gallium layer at high Rayleigh numbers have been continued by using the newly developed apparatus. Based of the present experiments, we found the quasi periodic fluctuation of convection patterns at a certain range of the Rayleigh number. The oscillation frequency of the patterns varies as a function of the Rayleigh numbers, where the higher frequency was observed at the higher Rayleigh number. (3)Examination of the results of the high resolution geodynamo simulations using the Earth Simulator revealed that the turbulent state in the fluid shell can be inferred from the temporal variation of geomagnetic fields. observed at the earth's surface. The results of the observations, laboratory experiments, and the numerical simulations can be integrated to infer the origin of the geomagnetic field and its variations.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (55 results)

All 2006 2005 2004 2003 Other

All Journal Article (51 results) Publications (4 results)

  • [Journal Article] Cell pattern of thermal convection induced by internal heating2006

    • Author(s)
      Ichikawa, H., K.Kurita, Y.Yamagishi, T.Yanagisawa
    • Journal Title

      Physics of Fluids 18

      Pages: 38101-38101

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Deformation of partially molten D" layer by small-scale convection and the resulting seismic anisotropy and ultralow velocity zone2006

    • Author(s)
      Okamoto, T., I.Sumita, T.Nakakuki, S.Yoshida
    • Journal Title

      Phys.Earth Planet.Inter. (in press)

    • NAID

      120002015004

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Deformation of partially molten D" layer by small-scale convection and the resulting seismic anisotropy and ultralow velocity zone2006

    • Author(s)
      Okamoto, T., I.Sumita, T.Nakakuki, S.Yoshida
    • Journal Title

      Phys.Earth Planet.Inter (印刷中)

    • NAID

      120002015004

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 超音波流速分布計測法による液体金属流動計測(第2報,液体ガリウム層における熱対流運動の可視化)2006

    • Author(s)
      田坂裕司, 柳澤孝寿, 山岸保子, 吉田将隆, 武田靖
    • Journal Title

      日本機械学会論文集B編 (印刷中)

    • NAID

      110004758299

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 低Pr数対流における速度分布と温度の同時計測2006

    • Author(s)
      田坂裕司, 吉田将隆, 武田靖, 柳澤孝寿
    • Journal Title

      第55回理論応用力学講演会講演論文集 NCTAM2006

      Pages: 629-630

    • NAID

      130005020472

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Geodynamo and Mantle Dynamics2005

    • Author(s)
      Hamano Y., T.Yanagisawa, Y.Yamagishi
    • Journal Title

      Journal of Geography 114

      Pages: 142-150

    • NAID

      10017472916

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental investigation of natural convection induced by internal heat generation2005

    • Author(s)
      Tasaka, Y., Y.Kudoh, Y.Takeda, T.Yanagisawa
    • Journal Title

      Journal of Physics : Conference Series 14

      Pages: 168-179

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Rayleigh-Benard convection in spherical shell with infinite Prandtl number at high Rayleigh number2005

    • Author(s)
      Yanagisawa, T., Y.Yamagishi
    • Journal Title

      Journal of the Earth Simulator 4

      Pages: 11-17

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of Heat Source Distribution on Natural Convection induced by Internal Heating2005

    • Author(s)
      Yuji TASAKA, Yasushi TAKEDA
    • Journal Title

      Int. J. Heat & Mass Trans 48

      Pages: 1164-1174

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Transition in Internally Heated Convection2005

    • Author(s)
      Y.TASAKA, Y.KUDOH, Y.TAKEDA, T.YANAGISAWA
    • Journal Title

      Bulletin 58^<th> Annual Meeting of the Division of Fluid Dynamics, American Physical Society 500

      Pages: 144-144

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ultrasonic Measurement of Thermal Convection in Liquid Gallium Layer2005

    • Author(s)
      M.YOSHIDA, Y.TASAKA, Y.TAKEDA, T.YANAGISAWA
    • Journal Title

      Bulletin of 58^<th> Annual Meeting of the Division of Fluid Dynamics, American Physical Society 50

      Pages: 181-181

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Rayleigh-Taylor instability of a particle packed viscous fluid : Implications for a solidifying magma2005

    • Author(s)
      Michioka, H., I. Sumita
    • Journal Title

      Geophys. Res. Lett 32

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A note on Maxwell's theory of poles2005

    • Author(s)
      Ji-Cheng Shao, Yozo Hamano, Michael Bevis
    • Journal Title

      Journal of Computational and Applied Mathematics 175

      Pages: 87-89

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Geodynamo and Mantle Dynamics2005

    • Author(s)
      Hamano Y, T.Yanagisawa, Y.Yamagishi
    • Journal Title

      Journal of Geography vol.114, No.2

      Pages: 142-150

    • NAID

      10017472916

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Rayleigh-Benard convection in spherical shell with infinite Prandtl number at high Rayleigh number2005

    • Author(s)
      Yanagisawa, T., Y.Yamagishi
    • Journal Title

      Journal of the Earth Simulator vol.4

      Pages: 11-17

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of Heat Source Distribution on Natural Convection induced by Internal Heating2005

    • Author(s)
      Yuji TASAKA, Yasushi TAKEDA
    • Journal Title

      Int.J.Heat & Mass Trans. Vol.48

      Pages: 1164-1174

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Transition in Internally Heated Convection2005

    • Author(s)
      Yuji TASAKA, Yoichi KUDOH, Yasushi TAKEDA, Takatoshi YANAGISAWA
    • Journal Title

      Bulletin 58^<th> Annual Meeting of the Division of Fluid Dynamics, American Physical Society Vol.50, No.9

      Pages: 144-144

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ultrasonic Measurement of Thermal Convection in Liquid Gallium Layer2005

    • Author(s)
      Masataka YOSHIDA, Yuji TASAKA, Yasushi TAKEDA, Takatoshi YANAGISAWA
    • Journal Title

      Bulletin of 58^<th> Annual Meeting of the Division of Fluid Dynamics, American Physical Society Vol.50, No.9

      Pages: 181-181

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Rayleigh-Taylor instability of a particle packed viscous fluid : Implications for a solidifying magma2005

    • Author(s)
      Michioka, H., I.Sumita
    • Journal Title

      Geophys.Res.Lett. 32

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] A note on Maxwell's theory of poles2005

    • Author(s)
      Ji-Cheng Shao, Y.Hamano, M.Bevis
    • Journal Title

      Journal of Comput.Appl.Mathematics 175

      Pages: 87-89

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 地磁気ダイナモとマントルダイナミクス2005

    • Author(s)
      浜野洋三, 柳澤孝寿, 山岸保子
    • Journal Title

      地学雑誌 vol.114 No.2

      Pages: 142-150

    • NAID

      10017472916

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effects of Heat Source Distribution on Natural Convection induced by Internal Heating2005

    • Author(s)
      Y.Tasaka, Y.Takeda
    • Journal Title

      International Journal of Heat and Mass Transfer 48

      Pages: 1164-1174

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Experimental investigation of natural convection induced by internalheat generation2005

    • Author(s)
      Y.TASAKA, Y.KUDOH, Y.TAKEDA, T.YANAGISAWA
    • Journal Title

      J.Phys : Conference Series 14

      Pages: 168-179

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Transition in Internally Heated Convection2005

    • Author(s)
      Y.TASAKA, Y.KUDOH, Y.TAKEDA, T.YANAGISAWA
    • Journal Title

      Bulletin of 58^<th> Annual Meeting of the Division of Fluid Dynamics, American Physical Society Vol.50, No.9

      Pages: 144-144

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Ultrasonic Measurement of Thermal Convection in Liquid Gallium Layer2005

    • Author(s)
      M.YOSHIDA, Y.TASAKA, Y.TAKEDA, T.YANAGISAWA
    • Journal Title

      Bulletin of 58^<th> Annual Meeting of the Division of Fluid Dynamics, American Physical Society Vol.50, No.9

      Pages: 181-181

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effects of Heat Source Distribution on Natural Convection induced by Internal Heating2005

    • Author(s)
      Tasaka, Y., Takeda, Y.
    • Journal Title

      International Journal of Heat and Mass Transfer 84-6

      Pages: 1164-1174

    • Related Report
      2004 Annual Research Report
  • [Journal Article] On the equatorial virtual pole distribution2004

    • Author(s)
      Shao, Ji-Cheng, Fuller, M., Hamano, Y.
    • Journal Title

      Earth Planets Space 56

      Pages: 589-598

    • NAID

      10017464648

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Geomagnetic observatory operates at the seafloor in the Northwest Pacific ocean2004

    • Author(s)
      Toh, H., Hamano, Y., Ichiki, M, Utada, H
    • Journal Title

      EOS 85

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Paleomagnetic constraints on the Archean geomagnetic field intensity obtained from komatiites of the Barberton and Belingwe greenstone belts, South Afr2004

    • Author(s)
      Yoshihara, A., Hamano, Y.
    • Journal Title

      Precambrian Res. 131

      Pages: 111-142

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Fundamental study for development of vector UVP -(1) concept and time information2004

    • Author(s)
      H.Ohbayashi, Y.Takeda, K.Yamaguchi
    • Journal Title

      Proc. 4^<th> International Symposium on Ultrasound Doppler Method 4

      Pages: 125-128

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Study of vortex ring dynamics using UVP2004

    • Author(s)
      Y.Murai, H.Kitaura, Z.Xiao, P.J.Thomas, Y.Takeda
    • Journal Title

      Proc. 4^<th> International Symposium on Ultrasound Doppler Method 4

      Pages: 3-8

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Geomagnetic observatory operates at the seafloor in the Northwest Pacific ocean2004

    • Author(s)
      Toh, H., Hamano.Y., Ichiki, M, Utada, H.
    • Journal Title

      EOS 85

      Pages: 467-473

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Paleomagnetic constraints on the Archean geomagnetic field intensity obtained from komatiites of the Barberton and Belingwe greenstone belts, South Africa and Zimbabwe2004

    • Author(s)
      Yoshihara, A., Hamano, Y.
    • Journal Title

      Precambrian Res. 131

      Pages: 111-142

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Fundamental study for development of vector UVP -(1) concept and time information2004

    • Author(s)
      H.Ohbayashi, Y.Takada, K.Yamaguchi
    • Journal Title

      Proc.4^<th> International Symp.on Ultrasound Doppler Method

      Pages: 125-128

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Paleomagnetic constraints on the Archean geomagnetic field intensity obtained from komatiites of the Barberton and Belingwe greenstone2004

    • Author(s)
      Yoshihara, A., Hamano, Y
    • Journal Title

      Precambrian Res 131

      Pages: 111-142

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Ultrasonic Velocity Profile Measurement for Thermal Convection of Liquid Gallium2004

    • Author(s)
      Tasaka, Y., Kitaura, H., Yoshida, M., Takeda, Y., Yanagisawa, T.
    • Journal Title

      Bulletin of 57^<th> Annual Meeting of DFD, APS Vol.49,No.9

      Pages: 194-194

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Rayleigh-Taylor instability of a particle packed viscous fluid : Implications for a solidifying magma2004

    • Author(s)
      Michioka, H., Sumita, I.
    • Journal Title

      Geophys.Res.Lett. 32

      Pages: 1029-1032

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Temperature Behavior of the Natural Convection induced by Internal Heating2003

    • Author(s)
      Y.Kudoh, Y.Tasaka, K.Yonekura, Y.Takeda
    • Journal Title

      Bulletin of 56^<th> Annual Meeting of DFD, APS 48

      Pages: 73-74

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A representation function for a distribution of points on the unit sphere - with applications to analyses of the distribution of virtual geomagnetic pole2003

    • Author(s)
      Shao, Ji-Cheng, Hamano, Y., Bevis, M., Fuller M.
    • Journal Title

      Earth Planets Space 55

      Pages: 395-404

    • NAID

      10011769227

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Secular variation of the geomagnetic field intensity during the past 2000 years in Japan2003

    • Author(s)
      Yoshihara, A., Kondo, A., Ohno, M., Hamano, Y
    • Journal Title

      Earth Planet. Sci. Letters 210

      Pages: 219-230

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental study of the transition time of convection patterns and its application to the Wilson cycle2003

    • Author(s)
      Yanagisawa, T., Hamano, Y
    • Journal Title

      Proc. Japan Acad. 79

      Pages: 99-104

    • NAID

      130000093699

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experiments on highly supercritical thermal convection in a rapidly rotating hemispherical shell2003

    • Author(s)
      Sumita, I., P.Olson
    • Journal Title

      J. Fluid Mech 492

      Pages: 271-287

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Development of Telemetrology System with UDM2003

    • Author(s)
      T.Ohkubo, J.Nagao, Y.Takeda, H.Tezuka, M.Mori
    • Journal Title

      Proc. 81st JSME Fluids Eng. Division Conference No. 1302

      Pages: 39-39

    • NAID

      110002509861

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Multiline Flow Rate Measurement Using Ultrasonic Doppler Method2003

    • Author(s)
      S.Wada, H.Kikura, M.Aritomi, Y.Takeda, M.Mori
    • Journal Title

      Proc. 81st JSME Fluids Eng. Division Conference No. 1302

      Pages: 32-32

    • NAID

      110002509854

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental Study on the Natural Convection induced by Internal Heating2003

    • Author(s)
      Y.Tasaka, Y.Kudoh, K.Yonekura, Y.Takeda
    • Journal Title

      Bulletin of 56^<th> Annual Meeting of DFD, APS Vol.48, No.10

      Pages: 135-135

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Multiline Flow Rate Measurement Using Ultrasonic Doppler Method2003

    • Author(s)
      S.Wada, H.Kikura, M.Aritomi, Y.Takeda, M.Mori
    • Journal Title

      Proc.81st JSME Fluids Eng.Division Conference No.1302

      Pages: 32-32

    • NAID

      110002509854

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A New Algorithm for Low Velocity Measurement by UVP2003

    • Author(s)
      N.Tadata, Y.Takeda, Y.Tasaka
    • Journal Title

      Proc.81st JSME Fluids Eng.Division Conference No.1302

      Pages: 33-33

    • NAID

      110002509855

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A representation function for a distribution of points on the unit sphere -with applications to analyses of the distribution of virtual geomagnetic poles2003

    • Author(s)
      Shao, Ji-Cheng, Hamano, Y., Bevis, M., Fuller M.
    • Journal Title

      Earth Planets Space 55

      Pages: 395-404

    • NAID

      10011769227

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Secular variation of the geomagnetic field intensity during the past 2000 years in Japan2003

    • Author(s)
      Yoshihara, A., Kondo, A., Ohno, M., Hamano, Y.
    • Journal Title

      Earth Planet.Sci.Letters 210

      Pages: 219-230

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental study of the transition time of convection patterns and its application to the Wilson cycle2003

    • Author(s)
      Yanagisawa, T., Hamano, Y.
    • Journal Title

      Proc.Japan Acad. 79

      Pages: 99-104

    • NAID

      130000093699

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experiments on highly supercritical thermal convection in a rapidly rotating hemispherical shell2003

    • Author(s)
      Sumita, I., P.Olson
    • Journal Title

      J.Fluid Mech. 492

      Pages: 271-287

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] Yoshihara, A., Kondo, A., Ohno, M., Hamano, Y.: "Secular variation of the geomagnetic field intensity during the past 2000 years in Japan."Earth Planet.Sci.Letters. 210. 219-231 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Shao, Ji-Cheng, Hamano, Y., Bevis, M., Fuller, M.: "A representation function for a distribution of points on the unit sphere - with applications analyses of the distribution of virtural geomagnetic poles."Earth Planets Space. 55. 395-404 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] TASAKA, Y., YONEKURA, K., KUDO, Y., TAKEDA, Y., YANAGISAWA, T.: "Dilatation of convection cell in the natural convection induced by internal heating."Physics of Fluids. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Sumita, I., P.Olson: "Experiments on highly supercritical thermal convection in a rapidly rotating hemispherical shell."J.Fluid Mechanics. 492. 272-287 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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