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2008 Fiscal Year Final Research Report

Understanding of a Mechanism of Geomagnetic Field Reversals by Highly Precise Numerical Simulations of the Geodynamo

Research Project

  • PDF
Project/Area Number 18340131
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionTokyo Institute of Technology

Principal Investigator

HONKURA Yoshimori  Tokyo Institute of Technology, 大学院・理工学研究科, 教授 (00114637)

Co-Investigator(Kenkyū-buntansha) MATSUSHIMA Masaki  東京工業大学, 大学院・理工学研究科, 助教 (20242266)
Project Period (FY) 2006 – 2008
Keywords地球ダイナモ / 地磁気逆転 / 数値シミュレーション
Research Abstract

地磁気逆転メカニズムの解明に向けて, 地球ダイナモの高精度数値シミュレーションを実施した. 速度場と磁場の特徴的長さスケールに着目して, 地球コア内における粘性散逸とオーム散逸を見積もった. 磁場の極性が逆転するときと, 逆転に至らずに元に戻るエクスカーションのときには, 磁場生成過程に明らかな違いがあることを示した. また, コア-マントル境界における熱流束分布及びその大きさがコアのダイナミクス及び磁場強度に対していかに影響するかを示した.

  • Research Products

    (18 results)

All 2008 2007 2006 2002

All Journal Article (6 results) (of which Peer Reviewed: 4 results) Presentation (12 results)

  • [Journal Article] Effects of thermally heterogeneous structure in the lowermost mantle on the geomagnetic field strength2008

    • Author(s)
      Takahashi, F., H. Tsunakawa, M. Matsushima, N. Mochizuki, and Y. Honkura
    • Journal Title

      Earth Planet. Sci. Lett. 272

      Pages: 738-746

    • Peer Reviewed
  • [Journal Article] Scale variability in convectiondriven MHD dynamos at low Ekman number2008

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Journal Title

      Phys. Earth Planet. Inter. 167

      Pages: 168-178

    • Peer Reviewed
  • [Journal Article] A numerical study on magnetic polarity transition in an MHD dynamo model2007

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Journal Title

      Earth Planets Space 59

      Pages: 665-673

    • Peer Reviewed
  • [Journal Article] Distinctive difference between the polarity reversal and excursion in an MHD dynamo model, in 2007 Annual Report, Research Center for the Evolving Earth and Planets2007

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Journal Title

      COE21 Program, Tokyo Institute of Technology

  • [Journal Article] Dipolar and non dipolar dynamos in a thin spherical shell geometry, in 2006 Annual Report, Research Center for the Evolving Earth and Planets2006

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Journal Title

      COE21 Program, Tokyo Institute of Technology

  • [Journal Article] Reexamination of a scalesimilarity model for the subgrid scale flux in the Earth's core2006

    • Author(s)
      Matsushima, M
    • Journal Title

      Geophys. Astrophys. Fluid Dynam 100

      Pages: 363-377

    • Peer Reviewed
  • [Presentation] Effects of thermally heterogeneous structure in the lowermost mantle on the geomagnetic field strength2008

    • Author(s)
      Takahashi, F., H. Tsunakawa, M. Matsushima, N. Mochizuki, and Y. Honkura
    • Organizer
      The 11^<th> Symposium of Study of the Earth' s Deep Interior
    • Place of Presentation
      Kunming, China
    • Year and Date
      2008-07-28
  • [Presentation] Fluid flow near the Earth' s core surface derived from geomagnetic field models (2)2008

    • Author(s)
      Matsushima, M., F. Takahashi, and Y.Honkura
    • Organizer
      日本地球惑星科学連合2008年大会
    • Place of Presentation
      千葉
    • Year and Date
      2008-05-28
  • [Presentation] Effects of thermally heterogeneous structure in the lowermost mantle on the geomagnetic field strength2007

    • Author(s)
      Takahashi, F., H. Tsunakawa, M. Matsushima, N. Mochizuki, and Y. Honkura
    • Organizer
      American Geophysical Union 2007 Fall Meeting
    • Place of Presentation
      San Francisco, U.S.A
    • Year and Date
      2007-12-12
  • [Presentation] Fluid flow near the Earth' s core surface derived from geomagnetic field models with constraint of radial dependence2007

    • Author(s)
      Matsushima, M., F. Takahashi, and Y. Honkura
    • Organizer
      American Geophysical Union 2007 Fall Meeting
    • Place of Presentation
      San Francisco, U.S.A
    • Year and Date
      2007-12-12
  • [Presentation] Effects of thermally heterogeneous structure in the lowermost mantle on the geomagnetic field strength2007

    • Author(s)
      Takahashi, F., H. Tsunakawa, M. Matsushima, N. Mochizuki, and Y. Honkura
    • Organizer
      第122回地球電磁気・地球惑星圏学会
    • Place of Presentation
      名古屋
    • Year and Date
      2007-10-01
  • [Presentation] Fluid flow near the Earth' s core surface derived from geomagnetic field models with constraint of radial dependence2007

    • Author(s)
      Matsushima, M., F. Takahashi, and Y. Honkura
    • Organizer
      第122回地球電磁気・地球惑星圏学会
    • Place of Presentation
      名古屋
    • Year and Date
      2007-09-30
  • [Presentation] Magnetic field intensification by lateral variation of the core mantle boundary heat flow in numerical dynamos2007

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉
    • Year and Date
      2007-05-21
  • [Presentation] Fluid flow near the Earth' s core surface derived from geomagnetic field models2007

    • Author(s)
      Matsushima, M., F. Takahashi, and Y. Honkura
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉
    • Year and Date
      2007-05-21
  • [Presentation] Scale variability in convectiondriven dynamos at low Ekman number2006

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Organizer
      American Geophysical Union 2006 Fall Meeting
    • Place of Presentation
      San Francisco, U.S.A
    • Year and Date
      2006-12-14
  • [Presentation] Scale variability in convectiondriven dynamos at low Ekman number2006

    • Author(s)
      Takahashi, F., M. Matsushima, and Y. Honkura
    • Organizer
      第120回地球電磁気・地球惑星圏学会
    • Place of Presentation
      相模原
    • Year and Date
      2006-11-05
  • [Presentation] Fluid flow near the Earth's core surface derived from geomagnetic field models2006

    • Author(s)
      Matsushima, M., F. Takahashi, and Y. Honkura
    • Organizer
      第120回地球電磁気・地球惑星圏学会
    • Place of Presentation
      相模原
    • Year and Date
      2006-11-05
  • [Presentation] Fluid flow near the Earth' s core surface derived from geomagnetic field models2002

    • Author(s)
      Matsushima, M., F. Takahashi, and Y. Honkura
    • Organizer
      American Geophysical Union 2006 Fall Meeting
    • Place of Presentation
      San Francisco, U.S.A
    • Year and Date
      2002-12-14

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Published: 2010-06-10   Modified: 2016-04-21  

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