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2005 Fiscal Year Final Research Report Summary

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
KeywordsEarth's core / dynamo action / Geomagnetism / liquid metal / thermal convection / turbulence / geomagnetic field / paleomagnetism
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.

  • Research Products

    (38 results)

All 2006 2005 2004 2003

All Journal Article (38 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: 038101

    • Description
      「研究成果報告書概要(和文)」より
  • [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)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Geodynamo and Mantle Dynamics2005

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

      Journal of Geography 114

      Pages: 142-150

    • Description
      「研究成果報告書概要(和文)」より
  • [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
  • [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
  • [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
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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

      Pages: Doi 10, 1029/2004GL021827

    • Description
      「研究成果報告書概要(和文)」より
  • [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
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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
  • [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
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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

      Pages: doi:10.1029/2004GL021827

    • Description
      「研究成果報告書概要(欧文)」より
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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(和文)」より
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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

    • Description
      「研究成果報告書概要(和文)」より
  • [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
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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
  • [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

    • Description
      「研究成果報告書概要(欧文)」より
  • [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

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Published: 2007-12-13  

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