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Study of Energy Build-up Mechanism for Solar Flare

Research Project

Project/Area Number 05640311
Research Category

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

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

KUROKAWA Hiroki  Kyoto Univ.Science Associate Prof., 理学部, 助教授 (80135508)

Co-Investigator(Kenkyū-buntansha) FUNAKOSHI Yasuhiro  Kyoto Univ.Science Assistant, 理学部, 助手 (80127133)
KITAI Reisaburo  Kyoto Univ.Science Assistant, 理学部, 助手 (40169850)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsSolar Activity / Solar Flare / Solar Surge / emerging flux region / Magnetic Shear / Twisted Flux Rope / magnetic reconnection / Halpha filtergrans / 太陽 活動 / Hα単色像 / 太陽フレアー
Research Abstract

Main results obtained in this research are summarized in the followings :
(1) A strong flare activity is produced, whenever a new emerging flux region rapidly develops a strong magmetic shear along the neutral line between an older bipolar sunspot pair. This fact strongly suggests that the successive emergence of a twisted flux rope, which is originally twisted in the convection zone, develops a strong and flare-productive magnetic shear.
(2) Many important data which enable us to study the relation between Halpha arch filament system (AFS) and soft X-ray microflares were successfuly obtained by the coordinated observations between the Hida DST and theYohkoh SXT.Especially noticeable is the first finding of the close casual relationship between emergence of an Halpha AFS loop and brightening of a soft X-ray coronal loop at the time of the microflare of 0057 UT on 11 June, 1994 ; the coronal loop attained its intensity maximum about 5 minutes after the the appearance of the emerging Halpha loop in Halpha-0.6 A.However, the brightening X-ray loop dose not completely coincide in space with the emerging Halpha AFS loop. The directions of the two loops incline by about 20 dgrees from each other. This evidence means that the emerging Halpha loop did not simply evolve into a hot coronal loop, but that some reconnection between the Halpha loop and the pre-existing coronal magnetic field produced the coronal brightening or the microflare.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Culhane,G.L.他: "Yohkoh Observations of the Creation of High-Temperature Plasma in the Flare of 16 December 1991" Solar Physics. 153. 307-336 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 小路真木子・黒河宏企: "Evolutional Characteristics of Multiple Spectral Lines During THE Impulsive Phase of Solar Flares" Publ.Astron.Soc.Japan. 47. 239-250 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Schmieder,B.他: "Chromospheric Ejections and Their Signaturs in X-ray Observed by Yohkoh" Adv.Space Res.vol.17.No.45. 17. 193-196 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] van Driel-Gesztelyi 他: "X-ray Bright Point Flares due to Magnetic Reconnection" Solar Rhysics. (印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 黒河宏企 他: "Observations of Solar Hα-Filament-Disappearances with a New Solar Flare-Monitoring Telescope at Hida Observatory" J.Geomag.Geopeletricity. 47(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 黒河宏企 他: "Observations Evidences of Magnetic Fild Reconnection Found in Hα Fine Structures" In Wang,J.& Sakurai,T. (eds).Proc.of Third China-Japan Seminor on Solar Physics. (印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kurokawa, H.et al.: ""Transient Brightenirgs of Soft X-ray Loops in Emerging Flux Regions"" Frontiers Science Series No.10 'X-ray Solar Physics from Yohkoh'. 59-62 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kurokawa, H.et al.: ""A Morphs logical Study of Magnetic Shear Development in a Flare-Productive Region NOAA 7270"" Proc.OF Kofu Symp.NRO Report. No.360. 283-287 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Cul hane, g.L.et al.: ""Yohkoh Observations of the Creation of High-Temperature Plasma in the Flare of 16 December 1991"" Solar Physics. 153. 307-336 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Shoji, M.and Kurokawa, H.: ""Evolutional Characteristics of Multiple Spectral Lines during the Impulsive Phase of Solar Flares"" Publ.Astron.Soc.Japan. 47. 239-250 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Schmieder, B.et al.: ""Chromospheric Ejections and Their Signatures in X-ray Observed by Yohkoh"" Adv.Space Res.17. 193-196 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kurokawa, H.et al: ""Observational Evidences of Magnetic Field Reconroction Found in Halpha Fine Structure"" In Wang, J.and Sakurai, T.(ed) Proc.of Third China-Japan Seminor on Solar Physics. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 黒河 宏企: "Hα Surge Activity at the First Stage of Magnetic Flux Emergence" ASP Conf.Series(IAO Colloq.No.141). 46. 507-510 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Ji G.P.: "High Resolution Spectral Observation During the Impulsive Phase of a Flare" Solar Physics. 149. 195-203 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 北井 礼三郎: "Flares on September 6,1992" Proc.of the Second Japan-China Seminor on Solar Physics. 215-219 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 黒河 宏企: "Emerging Flux Regions and Surge Activities in NOAA 7270" Proc.of the Second Japan-China Seminor on Solar Physics. 209-214 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Leka: "Diagnostics of twisted Flux Emergence(NOAA AR 7260)" Frontiers Science Series. 10. 25-28 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] R.C.Canfield: "The X Flare of 15 November,1991:Preflare Flux Emergence,Heating and Filam ant Eruption" Frontiers Science Series. 10. 153-156 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 黒河 宏企: "Transient Brightenings of SoftX-ray Loops in Emerging Flux Regions" Frontiers Science Series. 10. 59-62 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 北井 礼三郎: "Prominence Eruption in NOAA 7125 on April 6,1992" Frontiers Science Series. 10. 287-292 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 花岡 庸一郎: "Simultameous Observations of a Prominence Eruption Followed by a Csronal Arcade Formation in Radio,Soft X-ray,and Halpha" Publ.Astron.Soc.Japan. 46. 205-216 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 北井 礼三郎: "Flares on Septenber 6,1992" NRO Report No.360,Proc.of Kofu Sywp.147-150 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 黒河 宏企: "A Morphological Study of Magnetic Shear Development in a Flare Productive Region NOAA 7270" Proc.of Kofu Symp.NRO Repart No.360. 283-287 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 小路 真木子: "Evolutional Characteristics of Multiple Spectral Lines During the Impulssie phases of Solar Flares" Publ.Astron.Soc.Japan. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 黒河宏企: "Hα Surge Activity at the First Stage of Magnetic Flux Emergence" Astronomical Society of the Pacific Conference Series. 46. 507-510 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 黒河宏企: "Transient Brightenings of Soft X-ray Loops in Emerging Flux Regions" New Look on the Sun. (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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