Study on High-energy Particle Acceleration Mechanism during Solar Flares

对于耀斑期间的能量释放过程和粒子加速机制，我们明确了以下几点：(1)我们发现，在耀斑的两个电流环合并过程中，存在两种类型的磁重联过程：完全重联和部分重联。Yohkoh观测到了这些类型的重联。(2)我们发现电流环碰撞存在三种类型的电流：I型、Y型和X型，它们具有不同的能量释放特征。我们在Yohkoh的数据中发现了I型和X型的合并过程，这与我们的理论结果吻合得很好。(3)通过MHD模拟，我们发现在两个电流环的碰撞过程中，可以在很短的时间内产生快速的磁声激波。(4)通过3D粒子程序发现，在两个电流环的碰撞过程中，可以产生等离子体波和哨声波，并且MAT有助于等离子体的加热。(5)我们发现，如果考虑冷却效应，两个电流环的合并过程对于日冕的形成是重要的。

We made clear the following points about the energy release process and the particle acceleration mechanism during Solar Flares.(1)We found that there exist two types of magnetic reconnection process;Complete and Partial reconnection during the two current loop coalescence in solar flares. These types of reconnection were observed by the YOHKOH.(2)We showed that there exist three types of current of current loop collision;I,Y and X type and those have different signatures for the energy release. We found I and X type coalescence processes in the YOHKOH data, which show a good agreement with our theoretical results.(3)We found that during two current loops collision the fast magnetosonic shock waves can be generated within a very short time by MHD simulation.(4)We found by 3D particle code that during two current loops collision plasma waves and whistler waves can be generated and mat contribute to plasma heating.(5)We found that two current loop coalescence process is important for the prominence formation,if we take into account the cooling effect.