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Massive plasma transport across the magnetospheric low-latitude boundary layer

Research Project

Project/Area Number 13640446
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionTokyo Institute of Technology

Principal Investigator

FUJIMOTO Masaki  Graduate School of Science and Engineering, Tokyo Institute of Technology, Associate Professor, 大学院・理工学研究科, 助教授 (30242811)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsEddy turbulence / Magnetospheric low-latitude boundary layer / Velocity shear layer / Kelvin-Helmholtz instability / Two-fluid simulation / Finite electron inertia effects
Research Abstract

This study aims at clarifying massive plasma transport across the magnetospheric low-latitude boundary layer, which would constitute a plasma sheet formation process that is totally different from the well-known. The new transport process at low-latitude is not expected in a pure MHD model and thus would involve coupling of dynamics over decades in temporal as well as spatial scales, from MHD down to the electron scales. In order to study the transport process that results from cross-scale coupling effects, we have performed numerical simulations of MHD phenomena using two-dimensional two-fluid simulation code including finite electron inertia effects.
To be specific, we have simulated a development of MHD scale vortices that grow in velocity shear layers and have studied how the coupling to the electron dynamics emrges inside the MHD scale vortex.
(1) When the flow is perpendicular to the magnetic field, the vortex roll-up motion produces an intese current layer, inside of which excited is an instability due to finite electron inertia. This produces a seeding perturbation for the secondary velocity shear instability at the outer edge of the vortex, which produces smaller vortices that destroy the parent vortex.
(2) When there is an in-plane magnetic component, the field lines stretched by the roll-up motion are seen to reconnect. More dynamic reconnection is observed when the vortex size is larger relative to the electron scale.
In either case, coupling to electron scales are observed within highly rolled-up MHD-scale vortices and this produces new effects not obtainable within the MHD framework. It is expected that these effects would lead to massive transport across the velocity shear layer.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] H.Stenuit, et al., incl.M.Fujimoto: "A study of ion injections at the dawn and dusk polar edges of the auroral oval"J.Geophys.Res. 106. 29619 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Stenuit, et al., incl.M.Fujimoto: "Multi-spacecraft study on the dynamics of the dusk-flank magnetosphere under northward IMF : January 10-11, 1997"J.Geophys.Res. 107. 10.1029/2002JA 009246 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Fujimoto, T.Mukai, S.Kokubun: "Cold-dense plasma sheet and hot-dense ions in the magneotail"Adv.Space Res. 30/10. 2279 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Suzuki, M.Fujimoto, I.Shinohara: "Current sheet kink instability at ion-electron hybrid scale"Adv.Space Res.. 30/12. 2663-2666 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Oieroset, et al.incl.M.Fujimoto: "Spatial and temporal variations of the cold dense plasma sheel : Evidence for a low-latitude boundary layer source?"in Earth's low-latitude boundary layer, AGU Monograph Eds.P.T.Newell and T.Onsager. 133. 253 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Nishino, T.Terasawa, M.Fujimoto: "Observational signatures of plasma transport across the low-latitude boundary layer"in Earth's low-latitude boundary layer, AGU Monograph Eds.P.T.Newell and T.Onsager. 133. 265-272 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Fujimoto, T.Tonooka, T.Mukai: "Vortex-like Fluctuations in the Magnetotail Flanks and Their Possible Roles in Plasma Transport"Earth's low-latitude boundary layer, AGU Monograph Eds.P.T.Newell and T.Onsager. 133. 241-252 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Stenuit, et al., incl. M. Fujimoto: "A study of ion injections at the dawn and dusk polar edges of the auroral oval"J. Geophys. Res.. 106. 29,619 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Stenuit, et al., incl. M. Fujimoto: "Multi-spacecraft study on the dynamics of the dusk-flank magnetosphere under northward IMF : January 10-11,1997"J. Geophys. Res.. 107. 10.1029/2002JA009246 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Fujimoto, T. Mukai, and S. Kokubun: "Cold-dense plasma sheet and hot-dense ions in the magneotail"Adv. Space Res.. 30/10. 2279 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Suzuki, M. Fujimoto, and I. Shinohara: "Current sheet kink instability at ion-electron hybrid scale"Adv. Space Res.. 30/12. 2663 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Oieroset, et al., incl. M. Fujimoto , eds. by P. T. Newell and T. Onsager: "Spatial and temporal variations of the cold dense plasma sheet : Evidence for a low-latitude boundary layer source? in Earth's low-latitude boundary layer"AGU Monograph. 133 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Nishino, T. Terasawa, and M. Fujimoto , eds. by P. T. Newell and T. Onsager: "Observational signatures of plasma transport across the low-latitude boundary layer in Earth's low-latitude boundary layer"AGU Monograph. 133 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Fujimoto, T. Tonooka, and T. Mukai , eds. by P. T. Newell and T. Onsager: "Vortex-like Fluctuations in the Magnetotail Flanks and Their Possible Roles in Plasma Transport in Earth's low-latitude boundary layer"AGU Monograph. 133 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Stenuit, et al., incl.M.Fujimoto: "Multi-spacecraft study on the dynamics of the dusk-flank magnetosphere under northward IMF : January 10-11, 1997"J. Geophys. Res.. 107. Cit,#1333 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Fujimoto, T.Mukai, S.Kokubun: "Cold-dense plasma sheet and hot-dense ions in the magneotail"Adv. Space Res.. 30/10. 2663-2672 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Suzuki, M.Fujimoto, I.Shinohara: "Current sheet kink instability at ion-electron hybrid scale"Adv. Space Res.. 30/12. 2663-2666 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Oieroset, et al., incl.M.Fujimoto: "Spatial and temporal variations of the cold dense plasma sheet : Evidence for a low-latitude boundary layer source?"AGU Monograph. 133. 253-264 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Nishino, T.Terasawa, M.Fujimoto: "Observational signatures of plasma transport across the low-latitude boundary layer"AGU Monograph. 133. 265-272 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Fujimoto, T.Tonooka, T.Mukai: "Vortex-like Fluctuations in the Magnetotail Flanks and Their Possible Roles in Plasma Transport"AGU Monograph. 133. 241-252 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] I.Shinohara, H.Suzuki, M.Fujimoto, M.Hoshino: "Rapid Large Scale Magnetic Field Dissipation in a Collisionless Current Sheet via Coupling Between Kelvin-Helmholtz and Lower Hybrid Drift Instabilities"Phys.Rev.Lett. 87. 95001 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Suzuki, M.Fujimoto, I.Shinohara: "Current sheet kink instability at ion-electron hybrid scale"Adv.Space Res. (印刷中). (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.H.Kim, et al., incl. M.Fujimoto: "Spacecraft potential variations inside the magnetopause during transient events : Geotail observations"J.Geophys.Res. (印刷中). (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Fujimoto, T.Mukai, S.Kokubun: "Cold-dense plasma sheet and hot-dense ions in the magneotail"Adv.Space Res. (印刷中). (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Stenuit, et al., incl. M.Fujimoto: "A study of ion injections at the dawn and dusk polar edges of the auroral oval"J.Geophys.Res. (印刷中). (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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