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3D MHD Simulation Study of Solar Fares as Derived by the Satellite Yohkoh

Research Project

Project/Area Number 07454041
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionScience University of Tokyo

Principal Investigator

UCHIDA Yutaka  Physics Dept. Science University of Tokyo, Professor, 理学部, 教授 (90012814)

Co-Investigator(Kenkyū-buntansha) HIROSE Shigenobu  Physics Dept. Science University of Tokyo, Asociate Professor, 助手 (90266924)
SHIBATA Kazunari  National Astronomical observatory, Associate Professor, 助教授 (70144178)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1996: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1995: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsSun: Flares / Stars: Arcade Formation / Magnetic Field / Sun: Dark Filament / Magnetohydrodynamics / 電磁流体力学 / 計算機シミュレーション
Research Abstract

Among the new observational findings obtained by the Xray Satellite Yohkoh, the new findings we derived about arcade flarings turn out to be quite different from what the classical "reclosing of once opened-up bipolar arcade model" predicted. In the present work, we concentrate on seeking a new model that can explain these new observational findings. What we have found by the analyses of the Yohkoh data were, (1) faint pre-event structure of arcade formation is not a simple bipolar magnetic arcade as assumed in the classical model, but dual arcades side by side with inner legs crossing is invorved, (2) what we call a "spine" comes up rising sometime after the dark filament flies away, quite unexpected in the classical model. This is consisted of multiple thin threads, and can not be the locus of reconnecting points as may be explained in the classical model, and (3) in arcade flares, we found that there exist large loops connecting the top of the flare cusp back to the photosphere on b … More oth sides, and there is a bright structure near the axis of the dark tunnel below the cusp. These have no model counterpart in the classical model. Those findings, in contrast, are exactly what can be explained in the model proposed by Uchida. We, therefore, revived the "Quadruple Source Model" that was previously proposed by Uchida, but did not become the main stream due to the lack of good enough observation to confirm its coronal characteristic features that time. We have developed the equiliblium solution into a time-dependent simulation scheme, and seek solutions. In 1996, we reached a conclusion that the quadruple source model we have been developing give most of the observed behavior if we start the dynamic simulation from a squeezed state with longitudinal magnetic field in the neutral sheet in the corona above the central polarity-reversal line. The configuration can store magnetic energy in the form of magnetic stress, and can release it when some triggering helicity is injected into the dark filament part and squeeze it out from the neutral sheet. The stress energy stored in the entire region can be released through reconnection then allowed the reconnection to occur at the neutral point. This model explain the above-mentioned observed facts pretty well, and we start reporting about it. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] Yutaka Uchida: "Coronal Activity Observed by Yhkoh"J.Geomag.Geoelectr. 48. 279-290 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka Uchida: "Activity in the Solar Atmosphere as Observed by Yohkoh"Proc.Canary International Winter School for Astrophysics The Structure of the Sun. 353-400 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Results from the X-ray Solar Physics Satellite Yohkoh"Rontgenstrahlung from the Universe. 633-636 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Problems for Arcade and Loop Flare Models Revealed by Yohkoh"Magnetodynamic Phenomena in the Solar atmosphere Prototypes of Stellar Magnetic Activity. 295-302 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kazunari SHIBATA: "Hot Plasma Ejection Associated with Compact-loop Solar Flares"AstrophyJ.Lett. 451. 83-85 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shigenobu HIROSE: "Disk Accretion onto a Magnetized Young Star and Associated Jet Formation"Publ.Astron.Soc.Japan. 49. in press (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Magnetodynamic Phenomena in the Solar Atmosphere Prototypes of Stellar Magnetic Activity"Kluwer Academic Publishers. 636 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "X-ray Solar Physics from Yohkoh"Universal Academy Press. 340 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "New Aspects about Solar Flares Revealed by the Wide-dynamic Range, High-cadence Observation from Yohkoh."Adv. Space Res.. 17,(4/5). 19-26 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Coronal Activity Observed by Yohkoh"J. Geomag. Geoelectr.. 48. 279-290 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Activity in the Solar Atmosphere as Observed by Yohkoh"Proc. Canary International Winter School for Astrophysics The Structure of the Sun,. 353-400 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Results from the X-ray Solar physics Satellite Yohkoh."Rontgenstrahlung from the Universe,. 633-636 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Problems for Arcade and Loop Flare Models Revealed by Yohkoh"Magnetodynamic Phenomena in the Solar atmosphere- Prototypes of Stellar Magnetic Activity. 295-302 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kazunari SHIBATA: "Hot Plasma Ejection Associated with Compact-loop Solar Flares"Astrophy. J. Lett.. 451. 83-85 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shigenobu HIROSE: "Disk Accretion onto a Magnetized Young Star and Associated Jet Formation"Publ. Astron. Soc. Japan.. 49(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y. Uchida, S. Hirose, S.Cable, S.Uemura, K. Fujisaki, M. Torii, and S. Morita: "MHD Simulation of Dark Filament Eruption in Quadruple Source Model,"New Perspectives of Solar Prominences, eds. D.Webb, B.Schmieder, and D.Rust. (ASP Conf. Series, No150),. 384-387 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y. Uchida, S. Hirose, S.Cable, S.Uemura, K. Fujisaki, M. Torii, and S. Morita: "Solar Arcade Flarings as Magnetodynamic Process of Mass and Energy Shedding from Energuzed Magnetic Regions,"Hot Universe, eds. K.Koyama, S.Kitamoto, and M.Ito, (Kluwer Acaednic Publishers). 21-26 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity-"Universal Academy Press. 636 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka UCHIDA: "X-ray Solar Physics from Yohkoh"Universal Academy Press. 340 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka Uchida: "Coronal Activity Observed by Yohkoh" J.Geomag.Geoelectr.48. 279-290 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yutaka Uchida: "Activity in the Solar Atmosphere as Obsercved by Yohkoh" Proc.Canary International Winter School for Astrophysics The Structure of the Sun. 353-400 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yutaka UCHIDA: "Results from the X-ray Solar Physics Satellite Yohkoh" Rontgenstrahlung from the Universe. 633-636 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yutaka UCHIDA: "Problems for Arcade and Loop Flare Models Revealed by Yohkoh" Magnetodynmic Phenomena is the Solar atmosphere・・Prototypes of Stellar Magnetic Activity・・. 259-302 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kazunari SHIBATA: "Hot Plasma Ejection Associated with Compact-loop Solar Flares" Astrophy.J.Lett.451. 83-85 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Shigenobu HIROSE: "Disk Accretion onto a Magnetized Young Star and Associated Jet Formation" Publ.Astron.Soc.Japan. 49(in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yutaka UCHIDA: "Magnetodynamic Phenomena in the Solar Atmosphere・・Prototypes of Stellar Magnetic Activity・・" Kluwer Academic Publishers, 636 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yutaka UCHIDA: "X-ray Solar Physics from Yohkoh" Universal Academy Press, 340 (1994)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y. Uchida: "New Aspects about Solar Flares Revealed by the Wide-dynamic Range High-cadence Observations from Yohkoh(Invited paper)" Solar Flare, Coronal and Heliospheric Dynamics(Pergamon Press). (4/5)19-28 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] R. Matsumoto, Y. Uchida, et al.: "Radio Jets and the Formation of Active Galaxies" Astrophys. J.,. 414. 357-371 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Uchida: "Coronal Activity Observed by Yohkoh(Invited paper)" J. Geomag. Geoelectrivity. 48(in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Uchida et al.: "Activity in the Solar Atmosphere" The Structure of the Sun(book)(Cambridge University Press). (in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Uchida: "Problems for Arcade and Loop Flare Models Revealed by Yohkoh(Invited paper)" Magnetodynamic Phenomena in the Solar Atmosphere(book)(Kluwer Academic Publishers). (in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Z. Svestka, Y. Uchida et al.: "Large Active Coronal Phenomena in Yohkoh Images" Solar Phys.(in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Uchida et al.: "X-ray Solar Physics from Yohkoh" Universal Academy Press, 340 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Uchida et al.: "Magnetodynamic Phenomena in the Solar Atmosphere" Kluwer Academic Publishers(in press), 640 (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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