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1994 Fiscal Year Final Research Report Summary

Transient Proccsses near the Dayside Magnetopause Associated with Solar Wind Changes

Research Project

Project/Area Number 05452082
Research Category

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

Allocation TypeSingle-year Grants
Research Field Space and upper atmospheric physics
Research InstitutionNagoya University

Principal Investigator

KOKUBUN Susumu  Solar-Terrestrial Environment Laboratory, Nagoya University Professor, 太陽地球環境研究所, 教授 (00011502)

Co-Investigator(Kenkyū-buntansha) OGINO Tatsuki  Solar-Terrestrial Environment Laboratory, Associate Professor, 太陽地球環境研究所, 助教授 (00109274)
KAMIDE Yohsuke  Solar-Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (60113099)
Project Period (FY) 1993 – 1994
KeywordsStructure of magnetopause / Instability on the magnetopause / Solar wind-magnetosphere interaction / Magnetohydrodynamic waves
Research Abstract

Based on Geotail observations near the dayside magnetopause on October 17-18 and November 4,1992, we have studied oscillatory variations at the magnetopause and in the magnetosphere. The results are summarized as follows :
1. Magnetopause crossings, associated with the northward interplanetary magnetic field (IMF) observed on November 4, were characterized by quasi-periodic pulses of a sawtooth wave form in the magnetic filed and the plasma flow components tangential to the magnetopause. The direction of magnetic field outside the magnetopause current layr was northward with antisunward tilt, indicating the draping of magnetic filed on the magnetopause. Boundary normals of wavy magnetopause systematically inclined sunward on the upstreamside, while they tend to incline antisunward with considerable deviation on the downstream side. 2. When the magnetopause crossings were observed in association with the southward IMF,we also observed a clear inbound/outbound dependence of the magnetopause orientation consistent with the tailward-moving recurrent bumps at the magnetopause. However, recurrence of tailward-moving structures is less regular than that for the case of northward IMF.In addition, there is an implication that the northward (southward) flow along the magnetopause occurred for the inward (outward) directed magnetic filed component nonnal to the magnetopause. 3. Pc5 and compressional Pc3 pulsations were observed in the dayside magnetosphere on October 17-18. The signature of the Pc5 pulsations agrees with the theory of file line standing oscillations with the mode being the fundamental. The observed Pc5 pulsations were regarded to be triggered by sudden compressions and expansions of the magnetosphere. On the other hand, compressional Pc3 pulsations are consistent with fast magnetosonic waves propagating earthward.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 國分,征: "The Geotail magnetic field experiment" J.Geomag.Geoelectr.46. 7-21 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 國分 征: "Quasi-periodic oscilations of the magnetopause during northward sheath magnetic field" Geophys.Res.Lett.21. 2383-2886 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河野 英昭: "Magnetopause characteristics during a four-hour interval of multiple crossing observed with Geotail" Geophys.Res.Lett.21. 2895-2898 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高橋 主衛: "Geotail observation of magnetosonic Pc3 waves in the dayside magnetosphere" Geophys.Res.Lett.21. 2899-2993 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中村 正人: "Pc5 pulsations observed in the dayside magnetoshpere by Geotail" Geophys.Res.Lett.21. 2903-2906 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mozer,F.S.: "The morningside low-latitude boundary layer as determined from electric and magnetic field measurements on Geotail" Geophys.Res.Lett.21. 2983-2986 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kokubun, S.: "The GEOTAIL magnetic field experiment" J.Geomag.Geoelectr.46. 7-21 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kokubun, S.: "Quasi-periodic oscillations of the magnetopause during northward sheath magnetic field" Geophys.Res.Lett.21. 2883-2886 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawano, H.: "Magnetopause characteristics during a four-hour interval of multiple crossings observed with Geotail" Geophys.Res.Lett.21. 2895-2898 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahashi, K.: "Geotail observation of magnetosonic Pc3 waves in the dayside magnetosphere" Geophys.Res.Lett.21. 2899-2902 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakamura, M.: "Pc5 pulsations observed in the dayside magnetosphere by Geotail" Geophys.Res.Lett.21. 2903-2906 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mozer, F.S.: "The morningside low-latitude boundary layr as derived from electric and magnetic field measurements on Geotail" Geophys.Res.Lett.21. 2983-2986 (1994)

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

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Published: 1996-04-15  

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