磁重联区Alfven波及新生离子的加速

ALFVEN WWES IN THE MAGNETIC RECONNECTION REGIONS AND THE ACCELERATION OF NEWBORN IONS

利用二维混合数值模拟研究了有速度驱动、低等离子体β值情况下的磁场重联过程，结果表明磁重联过程可以产生Ａｌｆｖｅｎ波，该Ａｌｆｖｅｎ波动对重联区中的新生离子作用，使得新生离子经历投掷角散射过程，具有球壳分布特征，部分新生离子得到加速，其获得的最大能量约为４（ｍｉＶ２Ａ０／２），此加速过程所需的加速时间在１００／Ωｉ量级，是一个极快的加速机制，加速粒子能谱为双幂律谱．

By means of 2D-hybrid simulation code, magnetic driven reconnection in the low plasma β case. Results show that the Alfven waves can be produced in the magnetic reconnection process. The newborn ions can be pitch angle scattered by Alfven waves and have the shell distribution. Some newborn ions are accelerated and the maximum energy is about 4miV20/2. The acceleration takes about 100/Ωi and is thus extremely rapidly acceleration process.