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1992 Fiscal Year Final Research Report Summary

Cooperative Research of Solar Activity Based on Magnetic Shears

Research Project

Project/Area Number 02302015
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionNational Astronomical Observatory

Principal Investigator

HIRAYAMA Tadashi  Sol. Phys. Div. Nat. Astron. Obs. Prof., 太陽物理学研究系, 教授 (20012841)

Co-Investigator(Kenkyū-buntansha) UNNO Wasaburo  Fac. of Science Kinki Univ. Prof., 理学部, 教授 (30011414)
SHIBATA Kazunari  Sol. Phys. Div. Nat. Astron. Obs. Ass. Prof., 太陽物理学研究系, 助教授 (70144178)
WATANABE Tetsuya  Sol. Phys. Div. Nat. Astron. Obs. Ass. Prof., 太陽物理学研究系, 助教授 (60134631)
KUROKAWA Hiroki  Hida Obs. Kyoto Univ. Ass. Prof., 理学部, 助教授 (80135508)
MAKITA Mitsugu  Inst. of Astron. Kyoto Univ. Prof., 理学部, 教授 (90012806)
Project Period (FY) 1990 – 1992
KeywordsSolar Activity / Active Region / Magnetic Shear / Solar Flare
Research Abstract

The Yohkoh satellite, which was successfully launched in 1991, is still working quite well in orbit and bringing a lot of new results. The satellite is now in the regular-operation phase. The Flare Telescope and the Radio Heliograph in NAO also started their regular observations and constitute a global groundbased solar observation network, as well as the Hida Domeless Solar Telescope. The collaborations between Yohkoh and the observatories on the ground have been much activated in 1992. Based on this circumstance several workshops and symposia were held, centering the results from the Yohkoh data. In September 1992, the symposium "One Year Research of YOHKOH" was held at NAO mainly for domestic researchers and the second Yohkoh Science Meeting was held in February 1993, in which more than forty people participated from abroad. The both of them were quite successful and stimulated a lot of discussions and future collaborations. One of the new observational results in this solar activity maximum is that a picture of the solar activity has been established which originates from the magnetic reconnection and the magnetic shears. In solar flares, the scenes of the energy release via the magnetic reconnection and of the chromospheric evaporation of abruptly heated plasmas in the flaring loop were actually investigated. It has also revealed evident that the solar corona is quite dynamic, that a small flare-like transient brightening, a sudden increase of XBP intensity, and a jet-like abrupt motion of plasma are very common in active regions, that coronal holes globally change their structure of magnetic field and that all of them are closely related with the reconnection process of the magnetic field in the solar corona.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 内田 豊他: "Continual Expansion of the Active-Tegion Corona Observed by the Yohkoh Soft X-Ray Telescope" 日本天文学会欧文報告. 44. L155-L160 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 一本 潔他: "Effective Geometrical Thickness and Electron Density of a Falre of 1991 December 2 Observes with the Soft X-Ray Tele scope of Yohkoh and Coronagraph" 日本天文学会欧文報告. 44. L117-L122 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 柴田 一成他: "Observations of X-Ray Jets with the Yohkoh Soft X-ray Telescope" 日本天文学会欧文報告. 44. L173-L179 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒河 宏企他: "Detailed Comparison between Hα and Yohkoh X-Ray Images of a Confined Two-Ribbon Flare" 日本天文学会欧文報告. 44. L129-L134 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 常田 佐久他: "Observation of a Solar Flare at the Limb with the Yohkoh Soft X-Ray Telescope" 日本天文学会欧文報告. 44. L63-L70 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桜井 隆他: "Flare-Related Relaxation of Magnetic Shear as Observed with the Soft X-Ray Telescope of Yohkoh and with Vector Magneto graphs" 日本天文学会欧文報告. 44. L123-L128 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Uchida et al.: "Continual Expansion of the Active-Region Corona Observed by the Yohkoh Soft X-Ray Telescope" Publ. Astron. Soc. Japan. 44. L155-L160 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimoto et al.: "Effective Geometrical Thickness and Electron Density of a Flare of 1991 December 2 Observed with the Soft X-Ray Telescope of Yohkoh and Coronagraph" Publ. Astron. Soc. Japan. 44. L117-L122 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Shibata et al.: "Observations of X-Ray Jets with the Yohkoh Soft X-Ray Telescope" Publ. Astron. Soc. Japan. 44. L173-L179 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kurokawa et al.: "Detailed Comparison between Halpha and Yohkoh Soft X-Ray Images of a Confined Two-Ribbon Flare" Publ. Astron. Soc. Japan. 44. L129-L134 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Tsuneta et al.: "Observation of a Solar Flare at the Limb with the Yohkoh Soft X-Ray Telescope" Publ. Astron. Soc. Japan. 44. L63-L70 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sakurai et al.: "Flare-Related Relaxation of Magnetic Shear as Observed with the Soft X-Ray Telescope of Yohkoh and with Vector Magnetographs" Publ. Astron. Soc. Japan. 44. L123-L128

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

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Published: 1994-03-24  

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