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Detection of 20 million Degree, Superhot Flare Images with a Coronagraph

Research Project

Project/Area Number 63420002
Research Category

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

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

Principal Investigator

HIRAYAMA Tadashi  National Astron. Obs. Prof., 太陽物理学研究系, 教授 (20012841)

Co-Investigator(Kenkyū-buntansha) TSUNETA Saku  Univ. Tokyo, Fac. Sci. Astron. Center Res. Assoc., 理学部・天文学教育研究センター, 助手 (50188603)
OKAMOTO Tomizo  National Astron. Obs. Res. Assoc., 太陽物理学研究系, 助手 (70012862)
KUMAGAI Kazuyoshi  National Astron. Obs. Res. Assoc., 太陽物理学研究系, 助手 (50161691)
YAMAGUCHI Asami  National Astron. Obs. Assoc. Prof., 太陽物理学研究系, 助教授 (70158096)
WATANABE Tetsuya  National Astron. Obs. Assoc. Prof., 太陽物理学研究系, 助教授 (60134631)
日江井 栄二郎  国立天文台, 太陽物理学研究系, 教授 (60012796)
Project Period (FY) 1988 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥26,200,000 (Direct Cost: ¥26,200,000)
Fiscal Year 1991: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1990: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1989: ¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 1988: ¥12,000,000 (Direct Cost: ¥12,000,000)
KeywordsSolar Physics / Coronagraph / Flare (Solar eruption) / Prominence / コロナ・グラフ / プロミネンス(紅炎) / フレア / 太陽面爆発 / 超高温プラズマ
Research Abstract

The solar flare is transient explosive phenomena often occurring near the sunspots, and it attains to a temperature of some 20 million degree Kelvin. The cause of the high temperature is not known yet in spite of years of research.
In order to understand the physics involved we planned to construct a new coronagraph to be built on the Mt. Norikura Solar Observatory and to obtain white light images of the 10^7K flare which occurs beyond the limb of the Sun. Simultaneous observations were anticipated using this coronagraph and a Japanese scientific satellite, Solar-A, dedicated to study flares with X-ray imaing device.
A fully automated, 10cm aperture coronagraph was completed in 1990 and begun routine operation since Nov. 1990, and the satellite was successfully launched in Aug. 1991. Since then we have acquired a few flare images on both instruments. And we obtained the electron density of 5x10^9 electrons cm^<-3> and the geometrical thickness l=1x10^8-1x10^9cm, of which a value of l=10^8cm is a surprise and an essentially new result because the apparent geometrical size measured perpendicularly to the line of sight is usually 3-6x10^9cm. This must have important bearing upon flare theory, and we have just begun to investigate the problem. Polarimetric observation will also be conducted soon for determination of prominence magnetic fields.
In summary, we can conclude that the aim shown in the title is being achieved from the new coronagraph and further research is being continued with the collaboration of the Yohkoh satellite.

Report

(5 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (44 results)

All Other

All Publications (44 results)

  • [Publications] 熊谷 収可: "10cm新コロナグラフの製作と実験" 国立天文台台報. 1. 139-149 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T.Hirayama 他: "Electron Density Determination on Dec 2,1991 Flare Using the Yohkoh Soft Xーray and Coronagraph Imagos" Publ.Astron Soc.Japan. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.Tsuneta 他: "The Soft Xーray Telescope for SolarーA Mission" Solar Physics. 136. 37-67 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.Tsuneta 他: "Continuous Observations of Soft Xーray Flave Imges from the Yohkoh Soft Xーray Telescope" Publ.Astron.Soc.Japan. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] J.L.Culhame,…T.Watanabe 他: "The Bragg Crystal Spectrometar for Solar A" Solar Physics. 136. 89-104 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ichimoto,K.: "Solar Flare Telescope and 10cm New Coronatroph" Lecture Notes in Phys.-Flare Physics in Solar Actionity Maximum 22. 387. 320-323 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S^^ーvestka,Z.and Uchida,Y.(編者): "The Yohkoh(SolarーA)Mission" Kluwer Academic Publishers, 110 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Uchida,Y.,Cantield,P.C.Watanabe,T.Hiei,E.: "Flare Physics in Solar Activity Maximum 22" Springar-Verlag, 360 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kumagai, K. et. al.: "Construction of a New Coronagraph & Its Experiment" Report, National Astron Obs. 1. 139-149 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hirayama, T. et. al.: "Small Geometrical Thickness of A Flare of Dec 2, 1991" Publ. Astron. Soc. Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tsuneta, S. et. al.: "The Soft X-ray Telescope for Solar-A Mission" Solar Phys. 136. 37-67 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tsuneta, S. et. al.: "Continuous Observation of Soft X-ray Flare Images from the Yohkoh Soft X-ray Telescope" Publ. Astron Soc. Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Culhane, J. L., Watanabe, T. et. al.: "The Bragg Crystal Spectrometer for Solar A" Solar Physics. 136. 89-104 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ichimoto, K.: "Solar Flare Telescope an 10cm Coronagraph" Lecture Note in Phys. Flare Physics in Solar Activity Maximum 22. 387. 320-323 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Svestka, Z. and Uchida, Y. (eds.): Kluwer Academic Publisher. The Yohkoh (Solar-A) Mission, 110 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Uchida, Y. et. al. (eds.): Springer Verlag. Flare Physics in Solar Activity Maximum 22, 360 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 熊谷 収可 他: "10cm新コロナグラフの製作と実験" 国立天文台台報. 1. 139-149 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Hirayama 他: "Electron Rensity Detenuinatia an Dec 2,1991 Flare Usins the Yohkoh Soft Xーray and Coronagraph Iwagos" Publ.Astron.Soc.Japan. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] S.Tsuneta 他: "The Soft Xーray Telescope for SolarーA Mission" Solan Physios. 136. 37-67 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] S.Tsuneta 他: "Continuous Observations of Soft Xーray Flare Iwges from the Yohkoh Soft Xーray Tcelswre" Publ.Astron.Soc.Japan. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] J.L.Culhane,…T.Watanabe 他: "The Bragg Crystal Spectrometer for Solar A" Solar Physios. 136. 89-104 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Ichimoto,K.: "Solar Flare Telescore and 10cm New Coronagroph" Lecture Notes im Phys.ーFlare Pluysics in Soleu Actiorty Maximum 22. 387. 320-323 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Svestka,Z.and Uchida,Y. (編者): "The Yohkoh(SolarーA)Mission" Kluwer Academic Publishers, 110 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Uchida,Y.,Canfield,R.C,Watanabe,T.Hiei,E.: "Flare Physics in Solar Activity Maximum 22" SpringerーVerlag, 360 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] K.Kumagai,A.Yamaguchi,K.Ichimoto,Y.Nishino,T.Hirayama: "Construction and Experimentation of the New 10cm Coronagraph at the Norikura Solar Observatory" 天文台報. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] K.Ichimoto,T.Sakurai,A.Yamaguchi,K.Kumagai,Y.Nishino,Y.Suematsu,E.Hiei,T.Hirayama: "Solar Flare Telescopo and 10cm Coronagraph" Proceeding of the SolarーA meeting in '90. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Hirayama: "The Current Sheet and Joule Heating of a Slender magnetic Tube in the Upper Photosphere" Solar Physics. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Hirayama: "Magnetic Morphalogies of Solar Flanes" Lecture Nate in Physics“Flane Physics in Activity Maximum 22"ed.Y.Uchida,R.C.Canfield,E.Hiei,T.Watanabe. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Ogawara,T.Hirayama,H.Kurokawa: "The SolarーA Misson" Advances in Space Research. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Watanabe: "The SolarーA Related Science Pnagrams" Advances in Space Research. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Uchida,R.C.Canfield,E.Hiei,T.Watanabe: "Lecture Note in Physics“Flane Physics in Activity Maximum 22"" Springer Publisher, 450 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Nishikawa,J.,Hiramaya,T.: "Faculer Structures Derived From Precise Two-Color Contrast Observations." Solar Phys.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Hirayama,T.: "Magnetic Morphologies of Various Prominences." IAU Colloq.No117.Springer Publ.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Hirayama,T.: "Physical Conditions in Prominences." IAU Colloq.No117,Springer Publ.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Kodaira,K.,Watanabe,T.: "Imagery of the Virgo Cluster Region II.Total Far-Ultraviolet Flux of Galaxies," Astrophys.J.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Doschek,G.A.,Watanabe,T.: "On the Dependence of Solar Flare X-Ray spectral Line Intensity Ratios of Highly Ionized Sulfur,Calcium,and Iron on Electron Temperature,Diffential Emission Measure,and Atomic Physics," Astrophys,J.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 渡辺鉄哉: Publ.Astron.Soc.Japan. 40. 475-490 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 渡辺鉄哉: Solan Physics.

    • Related Report
      1988 Annual Research Report
  • [Publications] Acton,L.W.他多数(平山、渡辺): COSPAR Symposium. 27. (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 松野浩及び平山: Solon Physies. 117. 21-36 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 常田佐久: in "Activity in Cod Stellav Envelops,"O.Havnes他編. 325-340 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 山口朝三 他: 東京天文台報. 21. 203-212 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 平山淳 共著: "宇宙科学の最先端「太陽に残された謎」の章担当「大学と科学」公開シンポジウム組織委員会編" 朝日出版社, 104-117 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 常田佐久 共著: "宇宙科学の最先端「科学衛星"Solon-A"計画」の章担当" 朝日出版社, 136-144 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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