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UK-Japan Cooperative Study of Solar Flares with the Yohkoh Mission

Research Project

Project/Area Number 06044229
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionNational Astronomical Observatory

Principal Investigator

WATANABE Tetsuya  Solar Physics Division, National Astron.Soc.Japan Associate Professor, 太陽物理学研究系, 助教授 (60134631)

Co-Investigator(Kenkyū-buntansha) BENTLEY R.D.  Mullard Space Science Laboratory, Univeristy College London, 研究員
CULHANE J.L.  Mullard Space Science Laboratory, University College London, 教授
MASUDA Satoshi  Solar Terrestrial Environment Laboratory, Magoya University, 太陽地球環境研究所, 助手 (10262916)
HARA Hirohisa  Solar Physics Division, National Astronomical Observatory, 太陽物理学研究系, 助手 (20270457)
SAKAO Taro  Solar Physics Division, National Astronomical Observatory, 太陽物理学研究系, 助手 (00225781)
TSUNETA Saku  Institute of Astronomy, University of Tokyo, 理学部, 助教授 (50188603)
SHIBATA Kazunari  Solar Physics Division, National Astronomical Observatory, 太陽物理学研究系, 助教授 (70144178)
SAKURAI Takashi  Solar Physics Division, National Astronomical Observatory, 太陽物理学研究系, 教授 (40114491)
KOSUGI Takeo  Radio Astronomy Division, National Astronomical Observatory, 電波天文学研究系, 教授 (70107473)
OGAWARA Yoshiaki  High Energy Physics Division, Institute of Astronautical Scineces, 宇宙圏研究系, 教授 (80013671)
UCHIDA Yutaka  Department of Physics, Tokyo University of Science, 理学部, 教授 (90012814)
BENTLEY R.D.  Mullard Space Science Laboratory Univers, 研究員
平山 淳  国立天文台, 太陽物理学研究系, 教授 (20012841)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1995: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1994: ¥4,100,000 (Direct Cost: ¥4,100,000)
KeywordsSolar Flares / Solar High Energy Phenomena / Soft X-ry High Resolution Observation / Bragg Spectrometer / 科学衛星「ようこう」
Research Abstract

The sun observing satellite YOHKOH has been successfully operated for five years from the previous activity maximum and throughout the declining phase.All the scientific instruments onboard has been in good condition and the soft X-ray instruments can observe the quiet sun even at its minimum.
Investigating the whole set of data, the keyword of "magnetic reconnection" has been emerged as a fundamental process for producing high temperature plasmas in the corona.Loop-top hard X-ray sources newly found by Yohkoh show consistency with the "magnetic reconnection scenario." Characteristic of nonthermal line broadenings seen in helium-like sulphur lines were systematically investigated.The locations of hot plasmas at the time of the line broadening maximum were either footpoints or loop top of flaring loops.
Statistical studies of X-ray jets were also completed and they were mostly found in active regions with mixed magnetic polarity and strongly associated with emerging-flux regions.The interaction of emerged magnetic fields with pre-existing coronal field causes X-ray jets.Correspondence with micro-flares also suggests that the both phenomena come from the same mechanism.
On the other hand, some evidence also appeared for the mechanism of basic coronal heating was something other than "magnetic reconnection."
The Yohkoh dataset was compiled for nearly half of the solar cycle, with which studies of solar cycle and solar dynamo mechanisms will be done in future.The SoHO satellite launched in December 1995 will now station at the Lagrangean point and start its observations.Joint observations and collaborative studies with SoHO will be highly encouraged for the first space observations in the rising phase of the solar activity.

Report

(2 results)
  • 1995 Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Watanabe, T. et al.: "Temperature Structure of Active Regions Deduced from the Helium-Like Sulphur Lines" Solar Phys.157. 169-184 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T.: "Flaring Coronal Structures" Proc.IAU Colloq.144. 227-234 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ding, M.D. et al.: "Chromospheric Evaporation in FourSolar Flares Observed by Yohkoh" Astrophys. J.458. 391-396 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Pike, C.D. et al.: "Yohkoh Observations of FeXXVI X-Ray Line Emission from Solar Flares" Astrophys. J. in press. 464. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T.: "Temperature Structure of the Corona" Adv. Space Res.17. 239-245 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T.: "Spectral Peculiarity of the 3-October-1993 09:06 UT Flare" Proc.the Third China-Japan Seminar on Solar Physics. 89-96 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Wang, J.X., Ai, G.X., Sakural, T., Hirayama, T.: International Academic Publishers27HC01:Proc.the Third China-Japan Seminar on Solar Physics, 333 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yamashita, K., Watanabe, T.: "UV and X-Ray Spectroscopy of Astrophysical and Laboratory Plasmas" Universal Academy Press, 521 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Uchida, Y., Hudson, H.S., Kosugi, T.: "Magneto dynamic Phenomena in the Solar Atmosphere" Kluwer Academic Publishers(in press), (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T., et al.: "Temperature Structures of Active Regions Deduced from the Helium-Like Sulphur Lines" Solar Phys.157. 169-184 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T.: "Flaring Coronal Structures" Proc.IAU Colloq.144. 227-234 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ding, M.D., et al.: "Chromospheric Evaporation in Four Solar Flares Observed by Yohkoh" Astrophys.J.458. 391-396 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Pike, C.D., et al.: "Yohkoh Observations of FeXXVI X-Ray Line Emission from Solar Flares" Astrophys.J.464 (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T.: "Temperature Structure of the Corona" Adv.Space Res.17. 239-245 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Watanabe, T.: "Spectral Peculiarity of the 3-Octber-1993 09 : 06 U.T.Flare" Proc.the Third China-Japan Seminar on Solar Physics. 89-96 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Wang, H.X., Ai, G.X., Sakurai, T., Hirayama, T.: International Academic Publishers. Proc.the Third China-Japan Seminar on Solar Phys., 1-333 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yamashita, K., Watanabe, T.: Universal Academy Press. UV and X-Ray Spectroscopy of Astrophysical and Laboratory Plasmas, 1-521 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Uchida, Y., Hudson, H.S., Kosugi, T.: Kluwer Academic Publishers (in press). Magnetodynamic Phenomena in Solar Atmosphere, (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Pike,C.D.et al.: "Yohkoh Observations of FeXXVI X-Ray Line Emission from solar Flares" Submitted to Astrophys.J.(1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Ding,M.D.et al.: "Chromospheric Evaporation in Four Solar Flares Observed by Yohkoh" Submitted to Astrophys.J.(1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Farnik,F.and Watanabe,T.: "Spatial Resoluttions between Proflares and Flares as Derived from Yohkoh Soft X-Ray Images" Submitted to Solar phys.(1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Haraa-Murnion,L.K.et al.: "A Detailed Study of Helium-Like Sulphur Emission in Solar Flares" Submitted to Astrophys.J.(1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Watanabe,T.: "Themperature Structure of the Corona" Adv.Space Res in press. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Phillips,K.J.H.P.et al.: "Evidene for the Equality of the Solar Photospheric and Coronal Abundance of Iron" Adv.Space Res.15(7). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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