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1996 Fiscal Year Final Research Report Summary

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

Research Project

Project/Area Number 08044105
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, Assoc.Prof., 太陽物理学研究系, 助教授 (60134631)

Co-Investigator(Kenkyū-buntansha) SHIBATA Kazunari  Solar Physics Division, Assoc.Prof., 太陽物理学研究系, 助教授 (70144178)
TSUNETA Saku  Solar Physics Division, Prof., 太陽物理学研究系, 教授 (50188603)
SAKURAI Takashi  Solar Physics Division, Prof., 太陽物理学研究系, 教授 (40114491)
KOSUGI Takeo  Radio Astronomy Division, Prof., 電波天文学研究系, 教授 (70107473)
OGAWARA Yoshiaki  Institute of Astronautical, Prof. Science, High Energy Physics Division, 宇宙圏研究系, 教授 (80013671)
Project Period (FY) 1996
KeywordsSolar flares / Solar high energy phenomena / Soft X-ray high resolution observation / Bragg crystal spectrometer / Yohkoh Satellite
Research Abstract

Yohkoh has been working very well for more than five years and a half with no serious degradation and its operation entered into a phase in which we can do systematic activity-cycle related analyzes. Collaboration with the SoHO satellite had an important role. SoHO was successfully launched in December, 1995. Database of the half solar cycle and softwares for analysis were completed. Yohkoh Data Analysis Center (YDAC) set up in MSSL has playd a key role in organizing active international collaboration in Europe and became the European center of Yohkoh data flow. Compilation of atmic data helpful for analyzing the Yohkoh and SoHO data also made a good progress by activating discussions among UK and Japanese scientists.
The followings are brief summary of the new results : (1)BCS without collimators could diagnose SXV emission lines from single active region on the solar disk that appeared in July, 1996, and collaboration with a rocket experiment, SERTS,made it possible to reveal the temperature structure of an active region in May 1996. (2)SoHO EIT/CDS and Yohkoh SXT simultaneously observed jetlets (tiny jet-like structure) around the polar region, and found that these phenomena were also triggered by magnetic reconnection. (3)Analysis of a large number of impulsive flares seen in HXT suggested a new interpretation for nonthermal particle acceleration, especially for low energy cutoffs.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Watanabe,T.: "Flares and Coronal Heating of Solar and Stellar Outer Atmospheres" Proc.X-Ray Imaging and Spectroscopy of Coronal Plasmas. 555-558 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahashi,M.,et al.: "The Flare on 1992 August 17 23:58 UT" Publ. Astron.Soc.Japan. 48. 857-863 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yuda,S.,Hiei,E.,Takahashi,M.,Watanabe,T.: "Electron Temperature of Solar Flares Derived from Helium-Like Sulphur Lines" Publ.Astron.Soc.Japan. 49. 115-121 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Harta-Murnion,L.K.,et al.: "A Detailed Study of Helium-Like Sulphur Emission in Solar Flares and Laboratory Plasmas" Astron.Astropys.306. 670-684 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Farnik,F.,Hudson,H.S.,Watanabe,T.: "Spatial Relations between Preflares and Flares as Derived from Yohkoh Soft X-Ray Images" Solar.Phys.165. 169-179 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Gan,W.Q.,Watanabe,T.: "A Statistical Study for the Resonane Line of CaXIX Observed with Yohkoh Bragg Crystal Spectrometer" Solar Phys.(1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Uchida,Y.,Kosugi,T.,Hudson,H.S.: "Magnetodynamic Phenomena in the Solar Atmosphere -Prototypes of Stellar Magnetic Activity" Kluwer Academic Publisher, 636 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Bentley,R.D.,Mariska,J.T.: "Magnetic Reconnection in the Solar Atmosphere" Astronomical Society of the Pacific, 420 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Watanabe, T.: "Flares and Coronal Heating of Solar and Stellar Outer Atmospheres" Proc.X-Ray Imaging and Spectroscopy of Coronal Plasmas. 555-558 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahashi, M., et al.: "The Flare on 1992 August 17 23 : 58 UT" Publ.Astron.Soc.Japan.48. 857-863 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yuda, S., Hiei, E., Takahashi, M., Watanabe, T.: "Electron Temperature of Solar Flares Derived from Helium-Like Sulphur Lines" Publ.Astron.Soc.Japan.49. 115-121 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Harta-Murnion, L.K., et al.: "A Detailed Study of Helium-Like Sulphur Emission in Solar Flares and Laboratory Plasmas" Astron.Astropys.306. 670-684 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Farnik, F., Hudson, H.S., Watanabe, T.: "Spatial Relations between Preflares and Flares as Derived from Yohkoh Soft X-Ray Images" Solar Phys.165. 169-179 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Gan, W.Q., Watanabe, T.: "A Statistical Study for the Resonance Line of CaXIX Observed with Yohkoh Bragg Crystal Spectrometer" Solar Phys.(1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Uchida, Y., Kosugi, T., Hudson, H.S.: "Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity" Kluwer Academic Publisher. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Bentley, R.D., Mariska, J.T.: "Magnetic Reconnection in the Solar Atmosphere" Astronomical Society of the Pacific. (1996)

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

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Published: 1999-03-09  

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