"Energy Release, Particle Acceleration, and Magnetic Reconnection in Solar Flares"

本课题旨在揭示太阳耀斑的能量释放、粒子加速及其与磁重联的关系。这些都是国际宇航系统于1991年8月发射的Yohkoh卫星的主要目标。在过去的五年里，我们利用Yohkoh积累的大量数据，结合地面观测，旨在加深我们对这些过程如何发生的理解。项目团队组织得很好，几乎涵盖了日本所有的太阳物理学家。在这个项目的三年时间里，我们努力完善数据存档和分析工具，组织了几次针对特定主题的小型研讨会，并每年举办一次大型研讨会，交流思想和科学成果。我们取得了以下成绩：数据存档和分析工具的进步，包括Yohkoh硬x射线望远镜图像合成程序的大幅改进；2 .组织与国外SOHO、TRACE等太阳物理卫星的协同数据分析框架；利用Yohkoh和地面观测（如Nobeyama射电日像仪、Mitaka耀斑望远镜和Hida Domeless望远镜）的坐标数据分析，揭示了导致耀斑爆炸的复杂磁场几何形状；and4。理论或数值研究的进展表明，太阳耀斑和日冕物质抛射可以被理解为发生在日冕的磁重联的不同方面，条件略有不同。该项目的科学成果已在各种会议上的158篇期刊和论文集以及66次演讲（不包括在其他地方发表的）中进行了总结。我们在这个项目中组织的三次大型研讨会的会议记录已经出版。

This research project was proposed for unveiling the solar flare mechanism, i.e., energy release, particle acceleration, and their relation to magnetic reconnection. These have been the main objectives of the Yohkoh satellite, which was launched by ISAS in August 1991. With a large amount of data accumulated by Yohkoh in the past five years, in conjunction with ground-based observations, we have aimed to deepen our understanding on how these processes take place. The project team has been so organized as to cover almost all solar physicists in Japan. During the three-year term of this project, we have tried to improve the data archive and analysis tools, organized several mini-workshops on specific topics, and held a big symposium every year for exchanging ideas and science results.We have achieved the following :1. Progress in data archive and analysis tools, including drastic improvement of the Yohkoh hard X-ray telescope's image synthesis program ;2. Organization of collaborative data analysis framework with foreign solar physics satellites such as SOHO and TRACE ;3. Coordinate data analysis using Yohkoh and ground-based observations such as from Nobeyama Radioheliograph, Mitaka Flare Telescope, and Hida Domeless Telescope, resulting in revealing the compLex magnetic field geometry causing flare explosion ; and4. Progress in theoretical or numerical studies, which shows that solar flares and coronal mass ejections can be understood as different aspects of magnetic reconnection taking place in the corona with slightly different conditions.The scientific outputs from this project have been summarized in 158 journal and proceedings papers plus 66 talks (excluding those published elsewhere) in various conferences. The proceedings of the three big symposia we organized in this project were already published.