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PHYSICS OF MAGNETOSPHERIC POLAR CAP BY ANALYSIS OF FIELD-ALIGNED CURRENTS.

Research Project

Project/Area Number 61540305
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Space and upper atmospheric physics
Research InstitutionUniversity of Tokyo

Principal Investigator

IIJIMA Takesi  Faculty of Science, University of Tokyo, 理学部, 助教授 (70011624)

Project Period (FY) 1986 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
KeywordsWestward ring current / Horizontal radial current / Dipolarization / Region 1 field-aligned current / region2沿磁力線電力系 / サブストーム / プラズマ応力 / プラズマ分布 / 北向き惑星間空間磁場 / 赤道域半径歩行水平電流 / ダイポラリーゼイション / プラズマ圧力 / region2沿磁力線電流系 / region1沿磁力線電流系 / 沿磁力線電流 / REGION1電流系 / REGION2電流系 / 磁気圏尾部 / RING-CURRENT / 磁気嵐 / ダイポーラリゼィション / 沿磁力線電流系 / NBZ電流系 / 惑星間空間磁場
Research Abstract

I have obtained new knowledge on magnetospheric physics, by analyzing the geomagnetic field data that was acquired with various artificial satellites, which includes the following:
1. Large-scale field-aligned current systems associated with northward interplanetary magnetic field (NBZ current system).
The NBZ field-aligned currents are thought to flow so as to transfer the sunward plasma stress down to the polar cap ionosphere so that large-scale sunward plasma convection is maintained in the central polar-cap plasma domain. The acquisition of this sunward plasma stress from the interplanetary medium is thought to take place in the magnetospheric high-latitude boundary layer often called the plasma mantle.
2. Large-scale Region 1 and Region 2 field-aligned current systems.
The region 1 current system is thought to originated in the magnetospheric voltage generator, whereas the region 2 current system is ascribable to the combination of the voltage generator and current generator.
3. Large-scale magnetospheric equatorial currents.
The electric current flowing parallel to and near the geomagnetic equatorial plane is comprised of an azimuthal current flowing westward and a radial current flowing toward the earth in the evening sector and away from the earth in the morning sector. These horizontal currents exhibit a net positive divergence (source) in the evening sector and a net negative divergence (sink) in the morning sector. The location, flow direction and the intensities of these divergent currents are almost identical with those of the region 2 field-aligned current system. The westward ring current and the region 2 current system are closely connected.
4. Substorm-associated field-aligned currents.
The three-dimensional current system throughout the course of substorm is not solely ascribable to a diversion of magnetospheric cross-tail current but a development of radial current is essental.

Report

(4 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • 1986 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] T.IIJIMA.: Journal of Geophysical Research. 92. 2408-2424 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] R.FUJII.: Journal of Geophysical Research. 92. 4505-4513 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.IIJIMA.: Journal of Geophysical Research. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.IIJIMA.: Journal of Geophysical Research. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.IIJIMA.: AURORAL PHYSICS edited by C.-I.MENG Cambridge univ.Press. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. IIJIMA: "GLOBAL CHARACTERISTICS OF NORTHWARD IMF-ASSOCIATED (NBZ) FIELD-ALIGNED CURRENTS." Journal of Geophysical Research. 92. 2408-2424 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] R. FUJII: "CONTROL OF THE IONOSPHERIC CONDUCTIVITIES ON LARGE-SCALE BIRKELAND CURRENT INTENSITIES UNDER GEOMAGNETIC QUIET CONDITIONS." Jounal of Geophysical Research. 92. 4505-4513 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. IIJIMA: "LARGE-SCALE CHARACTERISTICS OF MAGNETOSPHERIC EQUATORIAL CURRENTS." Journal of Geophysical Research. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. IIJIMA: "SUBSTORM ASSOCIATED BIRKELAND CURRENTS IN THE NIGHTSIDE MAGNETOSPHERE." Journal of Geophysical Research. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. IIJIMA: "LARGE SCALE CURRENTS CONNECTING AURORAL IONOSPHERE AND MAGNETOSPHERE ASSOCIATED NORTHWARD IMF." AURORAL PHYSICS, Cambridge Univ. Press. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.IIJIMA: Journal of Geophysical Research. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.IIJIMA: Journal of Geophysical Research. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.IIJIMA: AURORAL PHYSICS,rdited by C-I.Meng Cambridge Univ.Press.(1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.IIJIMA: Journal of Geophysical Research. 92. 2408 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] R.FUJII: Journal of Geophysical Research. 92. 4505 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] T.IIJIMA: Transactions, American Geophysical Union. 68. 1423 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] T.IIJIMA: Transactions, American Geophysical Union. 68. 1442 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] T.IIJIMA: Journal of Geophysical Research. 92. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] R.FUJII: Journal of Geophysical Research. 92. (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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