1996 Fiscal Year Annual Research Report

磁場構造の進化と太陽フレア

Research Project

Project/Area Number	08044104
Research Institution	National Astronomical Observatory
Principal Investigator	桜井隆国立天文台, 太陽物理学研究系, 教授 (40114491)
Co-Investigator(Kenkyū-buntansha)	TANG Yuhua 南京大学, 助教授 FANG Cheng 南京大学, 教授 WANG Huaning 北京天文台, 助手 ZHANG Hongqi 北京天文台, 教授 AI Guoxiang 北京天文台, 教授黒河宏企京都大学, 理学部, 教授 (80135508) 小杉健郎国立天文台, 電波天文学研究系, 教授 (70107473) 一本潔国立天文台, 太陽物理学研究系, 助教授 (70193456) 末松芳法国立天文台, 太陽物理学研究系, 助教授 (50171111) 常田佐久国立天文台, 太陽物理学研究系, 教授 (50188603)
Keywords	太陽 / 太陽物理学 / 太陽黒点 / 太陽コロナ / 太陽磁場 / 太陽X線 / 磁気流体力学 / 太陽観測装置
Research Abstract	わが国の太陽観測衛星「ようこう」による太陽コロナのX線観測と、中国側の優れた光学観測・磁場観測データの組み合わせにより、フレア爆発のメカニズムを研究することを目的とした。平成8年10月13日〜10月23日の間、研究代表者・桜井は北京及び南京を訪問し、中国側研究者との研究討論を行い、太陽観測施設を視察したほか、将来の太陽観測装置の動向についても議論した。中国側からは4名の研究者を招聘した。Zhang Hongqi教授(北京天文台)は来日中、磁場と太陽フレアの関係についての研究を行った。1992年2月に現れた活動領域NOAA7070について、この領域が東側の縁にあったときに起こったフレア(リムフレア)と、領域が太陽の前面に出てきた後で起こったフレア(ディスクフレア)の比較から、フレアのX線源の3次元構造について考察した。 Fang Cheng教授(南京大学)は、活動領域NOAA7722の1994年5月16〜19日の観測データ(X線、磁場、Hα)を総合して、比較的穏やかなこの領域のコロナループの物理量とコロナ加熱の関係について考察した。 Tang Yuhua助教授(南京大学)は、太陽フィラメントの不安定性に関して、「ようこう」のX線データ、Hα観測、磁場観測を総合して、不安定化の条件について研究を行った。 Wang Huaning博士(北京天文台)は、X線画像に見られるコロナループは太さがほぼ一定であるのに対して、磁力線の形は高さと共に広がるはずであるという一見矛盾した事実に注目した。磁場の管の太さは見る方向によって異なるので、計算された磁力線の形から磁束管の太さを計算する手法をまず確立し、次に簡単な解析的モデルを用いて考察を行った。

Research Products

(26 results)

All Other

All Publications (26 results)

[Publications] M.J.Aschwanden,et al.: "Electron Time-of-Flight Distances and Flare Loop Geometries Compared from CGRO and Yohkoh Observations" Astrophys.J.468. 398-417 (1996)
[Publications] M.J.Aschwanden,et al.: "The Scaling Law between Electron Time-of-Flight Distances and Loop Lengths in Solar Flares" Astrophys.J.470. 1198-1217 (1996)
[Publications] R.Brajsa,et al.: "Helium 10830 Angstrom Measurements of the Sun" Solar Phys.163. 79-91 (1996)
[Publications] R.Brajsa,et al.: "Coronal Holes Detected Using Solar Microwave Measurements" 'Radio Emission from the Stars and the Sun' Astron.Soc.Pacific Conference Series. (submitted). (1996)
[Publications] M.D.Ding,et al.: "Chromospheric Evaporation in Four Solar Flares Observed by Yohkoh" Astrophs.J.458. 391-396 (1996)
[Publications] C.Fang,M.Ding,and J.C.Henoux: "Particle Beam Diagnostics Based on UV and Optical Spectra of Solar Flares" Proc.SOLTIP3 Symposium. (submitted). (1996)
[Publications] K.Ichimoto,et al.: "Measurement of Coronal Electron Temperature at the Total Eclipse on 1994 November 3" Publ.Astron.Soc.Japan. 48. 545-554 (1996)
[Publications] K.Ichimoto,et al.: "Measurement of the Coronal Electron Temperature at the Total Eclipse on 3rd Nov.1994" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 413-414 (1996)
[Publications] S.Nagata,et al.: "High Wavelength Resolution XUV Multilayer Mirror" Applied Optics. (in press). (1997)
[Publications] M.Nishio,et al.: "Magnetic Field Configuration in Impulsive Solar Flares Inferred from Colaligned Microwave/X-ray Images" Astrophys.J.(submitted). (1996)
[Publications] A.Okubo,et al.: "X-ray and Magnetic Features of H-alpha Surges" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 437-438 (1996)
[Publications] T.Ozaki,et al.: "A New High Thermal-Conductivity Material for High Precision Space Optics" Proc.SPIE 2804. (in press). (1997)
[Publications] T.Sakao,et al.: "Japanese Sounding Rocket Experiment with the Solar XUV Doppler Telescope" Proc.SPIE 2804. (in press).
[Publications] T.Sakurai: "Heating Mechanisms of the Solar Corona" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 21-27 (1996)
[Publications] T.Sakurai and J.C.Chae: "Maximum Energy of Force-Free Magnetic Fields" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 579-580 (1996)
[Publications] T.Sakurai,et al.: "STEP Project Team 1 (Solar Activity) : Team Report" STEP GBRSC News. 6-1. 2-5 (1996)
[Publications] T.Sakurai,Y.Yan: "Coronal Loops and Magnetic Field Modelin -A New Boundary Integral Representation for Force-Free Magnetic Fields-" Proc.SOLTIP3 Workshop. (submitted). (1997)
[Publications] B.V.Somov and T.Kosugi: "Collisionless Reconnection and High Energy Particle Acceleration in Solar Flares" Astrophys.J.(submitted). (1996)
[Publications] M.Takahashi,et al.: "The Solar Flare of 1992 August 17 23:58 UT" Publ.Astron.Soc.Japan. 48. 857-863 (1996)
[Publications] Y.Tang,et al.: "Filament Current Systems and Solar Flares" Solar Phys.(in press). (1996)
[Publications] S.Tsuneta: "Magnetic Reconnection : Open Issues" PASP Conf.series. (in press). (1997)
[Publications] S.Tsuneta,et al.: "Hot and Super-Hot Plasmas above an Impulsive Flare Loop" Astrophys.J.(in press). (1997)
[Publications] P.Venkatakrishnan,et al.: "Enhanced He I Absorption at the Feet of X-ray Loops" Publ.Astron.Soc.Japan. 48. L1-L4 (1996)
[Publications] H.Zhang: "Spatial Configuration of Highly Sheared Magnetic Structures in Active Region NOAA 6659 in 1991 June" Astrophys.J.471. 471. 1049-1057 (1996)
[Publications] H.Zhang: "Magnetic Configuration of a Sunspot Region Using the H-beta Line" Astron.Astrophys.Suppl.119. 1-6 (1996)
[Publications] J.Zhao,C.Fang,and M.D.Ding: "Analysis of 2D H-alpha Spectra and Magnetic Field during the Impulsive Phase of a Solar Flare" Solar Phys.(submitted). (1996)

1996 Fiscal Year Annual Research Report

磁場構造の進化と太陽フレア

Principal Investigator

桜井 隆 国立天文台, 太陽物理学研究系, 教授 (40114491)

Research Products

[Publications] M.J.Aschwanden,et al.: "Electron Time-of-Flight Distances and Flare Loop Geometries Compared from CGRO and Yohkoh Observations" Astrophys.J.468. 398-417 (1996)

[Publications] M.J.Aschwanden,et al.: "The Scaling Law between Electron Time-of-Flight Distances and Loop Lengths in Solar Flares" Astrophys.J.470. 1198-1217 (1996)

[Publications] R.Brajsa,et al.: "Helium 10830 Angstrom Measurements of the Sun" Solar Phys.163. 79-91 (1996)

[Publications] R.Brajsa,et al.: "Coronal Holes Detected Using Solar Microwave Measurements" 'Radio Emission from the Stars and the Sun' Astron.Soc.Pacific Conference Series. (submitted). (1996)

[Publications] M.D.Ding,et al.: "Chromospheric Evaporation in Four Solar Flares Observed by Yohkoh" Astrophs.J.458. 391-396 (1996)

[Publications] C.Fang,M.Ding,and J.C.Henoux: "Particle Beam Diagnostics Based on UV and Optical Spectra of Solar Flares" Proc.SOLTIP3 Symposium. (submitted). (1996)

[Publications] K.Ichimoto,et al.: "Measurement of Coronal Electron Temperature at the Total Eclipse on 1994 November 3" Publ.Astron.Soc.Japan. 48. 545-554 (1996)

[Publications] K.Ichimoto,et al.: "Measurement of the Coronal Electron Temperature at the Total Eclipse on 3rd Nov.1994" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 413-414 (1996)

[Publications] S.Nagata,et al.: "High Wavelength Resolution XUV Multilayer Mirror" Applied Optics. (in press). (1997)

[Publications] M.Nishio,et al.: "Magnetic Field Configuration in Impulsive Solar Flares Inferred from Colaligned Microwave/X-ray Images" Astrophys.J.(submitted). (1996)

[Publications] A.Okubo,et al.: "X-ray and Magnetic Features of H-alpha Surges" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 437-438 (1996)

[Publications] T.Ozaki,et al.: "A New High Thermal-Conductivity Material for High Precision Space Optics" Proc.SPIE 2804. (in press). (1997)

[Publications] T.Sakao,et al.: "Japanese Sounding Rocket Experiment with the Solar XUV Doppler Telescope" Proc.SPIE 2804. (in press).

[Publications] T.Sakurai: "Heating Mechanisms of the Solar Corona" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 21-27 (1996)

[Publications] T.Sakurai and J.C.Chae: "Maximum Energy of Force-Free Magnetic Fields" 'Magnetodynamic Phenomena in the Solar Atmosphere-Prototypes of Stellar Magnetic Activity' IAU Colloquium No.153. 579-580 (1996)

[Publications] T.Sakurai,et al.: "STEP Project Team 1 (Solar Activity) : Team Report" STEP GBRSC News. 6-1. 2-5 (1996)

[Publications] T.Sakurai,Y.Yan: "Coronal Loops and Magnetic Field Modelin -A New Boundary Integral Representation for Force-Free Magnetic Fields-" Proc.SOLTIP3 Workshop. (submitted). (1997)

[Publications] B.V.Somov and T.Kosugi: "Collisionless Reconnection and High Energy Particle Acceleration in Solar Flares" Astrophys.J.(submitted). (1996)

[Publications] M.Takahashi,et al.: "The Solar Flare of 1992 August 17 23:58 UT" Publ.Astron.Soc.Japan. 48. 857-863 (1996)

[Publications] Y.Tang,et al.: "Filament Current Systems and Solar Flares" Solar Phys.(in press). (1996)

[Publications] S.Tsuneta: "Magnetic Reconnection : Open Issues" PASP Conf.series. (in press). (1997)

[Publications] S.Tsuneta,et al.: "Hot and Super-Hot Plasmas above an Impulsive Flare Loop" Astrophys.J.(in press). (1997)

[Publications] P.Venkatakrishnan,et al.: "Enhanced He I Absorption at the Feet of X-ray Loops" Publ.Astron.Soc.Japan. 48. L1-L4 (1996)

[Publications] H.Zhang: "Spatial Configuration of Highly Sheared Magnetic Structures in Active Region NOAA 6659 in 1991 June" Astrophys.J.471. 471. 1049-1057 (1996)

[Publications] H.Zhang: "Magnetic Configuration of a Sunspot Region Using the H-beta Line" Astron.Astrophys.Suppl.119. 1-6 (1996)

[Publications] J.Zhao,C.Fang,and M.D.Ding: "Analysis of 2D H-alpha Spectra and Magnetic Field during the Impulsive Phase of a Solar Flare" Solar Phys.(submitted). (1996)

桜井隆国立天文台, 太陽物理学研究系, 教授 (40114491)