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A study of mid-latitude field-aligned currents

Research Project

Project/Area Number 10640430
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

IYEMORI Toshihiko  Graduate School of Science, Kyoto Univ., Professor, 大学院・理学研究科, 教授 (40144315)

Co-Investigator(Kenkyū-buntansha) TAKEDA Masahiko  Graduate School of Science, Kyoto Univ., Instructor, 大学院・理学研究科, 助手 (30236484)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordsfield-aligned current / mid-latitude / ionospheric current / magnetospheric current / MU radar / HF radar / neutral wind / Magnetic field / neutral wind / field-aligned current
Research Abstract

1. The magnetic effects from mid-latitude field-aligned currents have been estimated from a model calculation and compared with the ground geomagnetic observations as well as the Oersted satellite observations. It has been shown by a model calculation that the field-aligned current effects strongly depend on the dip angle of geomagnetic main field just over the ionospheric altitude. From the satellite observation, the existence of a net current system which flows into the ionosphere on the day side and flows out on the night side has been confirmed.
2. The existence of the mid-latitude field-aligned current has been confirmed by a statistical analysis of the DE-2 satellite magnetic observation.
3. A comparison of the MU radar electric field observation and ground geomagnetic field variation suggested that the most of the ground geomagnetic perturbation come from the magnetospheric current system which include the field-aligned currents.
4. From a statistical analysis of the HF radar observation, it has been found that the occurrence frequency of ionospheric irregularities has a peak distribution around the terminator on the dusk side.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Iyemori, T.: "Formation of storm-time ring current and the Dst field ; Some recent topics"Magnetospheric Current Systems, AGU Monograph. 118(印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Iyemori, T.: "Formation of storm-time ring current and the Dst field : Some recent topics"Magnetospheric Current Systems, AGV Monograph. Vol. 118 (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Terada,T.Iyemori,M.Nose他: "Storm-time magnetic field variations observed by the FTS-VI satellite"Earth Planets Space. 50. 853-864 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Nose,M.Itemori,M.Takeda他: "Automated detecction of Pi2 pulsations using wavelet analysis : 1.Method and an application for substorm monitoring"Earth Planets Space. 50. 773-783 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Iyemori,T: "Formation of storm-time ring current and the Dstfield : Some recent topics"Magnetospheric Current Systems,AGU Monograph. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hosokawa,K,S.Yukimatsu,T.Iyemori and N.Sato: "Characteristics of solar flare effect in the high-latitude ionosphere as observed by the Super DARN radars"Proc.NIPR Sympo. Upper Atmosph.Phys.. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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