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Study of Activity Mechanism in the Solar Corona Based on Realistic-Data Simulations

Research Project

Project/Area Number 12640236
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionHIROSHIMA UNIVERSIlY

Principal Investigator

KUSANO Kannya  Hiroshima University, Graduate School of Associate, Professor, 大学院・先端物質科学技術研究科, 助教授 (70183796)

Co-Investigator(Kenkyū-buntansha) YOKOYAMA Takaaki  University of Tokyo, School of Sciences, Associate Professor, 大学院・理学研究科, 助教授 (00311184)
Project Period (FY) 2000 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordsthe Sun / flares / corona / MHD / simulation / reconnection / magnetic helicity / plasma / ヘリシティ / 太陽磁場 / 不安定性
Research Abstract

This project was carried out aiming to reveal the physical mechanism of the solar coronal energetic activity in terms of the combination of the detail observation of solar magnetic field by vector magnetographs and the three-dimensional numerical simulations. The following important results are obtained. (1)We developed a new methodology, which enables the measurement of magnetic helicity flux across the photospheric surface. (2)We found a clear correlation between the magnetic helicity flux across the photosphere and the soft X-ray energy flux out of the solar corona. (3)We revealed that the reversal of magnetic shear activates the energy liberation of the solar coronal magnetic field. (4)Based on the results above, we proposed a new flare model called "Reversed-Shear Flare Model", and examined the validity of that using the three-dimensional numerical simulations. (5)We investigated the spatial correlation between the magnetic shear structure and the brightening in pre-flare phases, and revealed that the initial bright points were located at the shear inversion line, as the Reversed-Shear Flare Model predicted. These results demonstrate the hypothesis that the magnetic helicity flux across the photosphere can play a cause of the solar coronal activity. In particular, it should be noted that the Reversed-Shear Flare Model can explain several important features seen in observation of solar flares. However, the development of the three-dimensional simulation only using realistic data is not yet completed, and remains for future works.

Report

(5 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] K.Kusano: "Trigger Mechanism of Solar Flares in Magnetic Arcade of Reversed Magnetic Shear"The Astrophysical Journal. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 草野完也: "天体プラズマ現象における多階層シミュレーション研究の展望-太陽磁気リコネクション現象の多階層性とシミュレーション-"Journal of Plasma and Fusion Research. 79. 496-503 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yokoyama: "Relation between Magnetic Helicity Injection and Flare Activities in Active Region NOAA8100"Advances in Space Research. 32. 1949-1952 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Annihilation of Magnetic Helicity : A New Model for Solar Flare Onset"Advances in Space Research. 32. 1931-1936 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Measurement of Magnetic Helicity Flux into the Solar Corona"Advances in Space Research. 32. 1917-1922 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Measurement of Magnetic Helicity and Free Energy Loading into the Solar Corona"The Astrophysical Journal. 577. 501-512 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Numerical Study of Three-Dimensional Magnetohydrodynamic Instability in the Solar Coronal Magnetic Arcades"The Astrophysical Journal. 571. 532-539 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Trigger Mechanism of Solar Flares in Magnetic Arcade of Reversed Magnetic Shear"The Astrophysical Journal. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Prospect for Multiple Time and Spatial Scale Simulation Research in Astrophysical Plasma Phenomena, Multiple Scale Simulation of Magnetic Reconnection Phynomena in the Solar Corona"Journal of Plasma Fusion Research. 79. 496-503 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yokoyama: "Relation between Magnetic Helicity Injection and Flare Activities in Active Region NOAA8100"Advances in Space Research. 32. 1949-1952 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Annihilation of Magnetic Helicity : A New Model for Solar Flare Onset"Advances in Space Research. 32. 1931-1936 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Measurement of Magnetic Helicity Flux into the Solar Corona"Advances in Space Research. 32. 1917-1922 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Measurement of Magnetic Helicity and Free Energy Loading into the Solar Corona"The Astrophysical Journal. 577. 501-512 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kusano: "Numerical Study of Three-Dimensional Magnetohydrodynamic Instability in the Solar Coronal Magnetic Arcades"The Astrophysical Journal. 571. 532-539 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 草野完也: "天体プラズマ現象における多階層シミュレーション研究の展望-太陽磁気リコネクション現象の多階層性とシミュレーション-"Journal of Plasma and Fusion Research. 79. 496-503 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Yokoyama: "Relation between Magnetic Helicity Injection and Flare Activities in Active Region NOAA8100"Advances in Space Research. 32. 1949-1952 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kusano: "Annihilation of Magnetic Helicity : A New Model for Solar Flare Onset"Advances in Space Research. 32. 1931-1936 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kusano: "Measurement of Magnetic Helicity Flux into the Solar Corona"Advances in Space Research. 32. 1917-1922 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Nakahara: "Simulation Study of Energy Conversion Process in Magnetohydrodynamic Turbulence Due to Magnetorotational Instability"Journal of the Physical Society of Japan. 73. 94-101 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kusano, et al.: "Measurement of Magnetic Helicity Injection and Free Energy Loading into the Solar Corona"The Astrophysical Journal. 577. 501-512 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] N.Nishikawa, K.kusano: "Effect of Density Stratification on the Thermal Convection in a Rotating Spherical Shell"The Astrophysical Journal. 581. 745-759 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kusano: "Three-Dimensional Magnetohydrodynamic Instability in the Solar Coronal Magnetic Arcades"Astrophysical Journal. 571(発表予定). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Kusano et al.: "Multi-Wavelength Observations of Coronal Structure and Dynamics, COSPAR Colloquia Series"Elsevier Science(発表予定). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] P.K.Browning: "Numerical Study of Nonlinear Forced Magnetic Reconnection"Physics of Plasmas. 8. 132-138 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Kusano: "Three-Dimensional Simulation Study of Magnetic Reconnection in the Solar Corona"Earth, Planets and Space. 53(印刷中). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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