外辐射带动态演化的粒子模拟研究

ARTICLE SIMULATION ON THE DYNAMICAL EVOLUTION OF RADIATION BELT PARTICLES

运用计算机实验方法即三维电磁粒子模拟方法初步研究了暴时扰动情况下外辐射带粒子环境的动态演化特性．模拟计算了暴时辐射带粒子环境的演化情况．模拟计算结果显示，高能质子、电子注入午夜辐射带后，两者一方面沿磁力线做弹跳运动，向高纬扩展，部分注入质子和电子沉降于南北两极区域；另一方面，注入质子和电子还经历顺时针和逆时针方向的漂移运动，粒子能量越大，漂移速度越快．暴时多次注入引起整个辐射带粒子通量的大幅增强；粒子注入频次和强度越大，辐射带粒子通量增幅越大．本项研究为开发研制完整的辐射带动态模式积累了有益的经验．

In this research, the spatial and temporal evolution properties of the external radiation belt particles during geomagnetic disturbances have been investigated by using a three dimensional relativistic electromagnetic particle code. The calculation shows that, the injected energetic protons and electrons perform bounce movements along geomagnetic field lines and can expand into the high latitude region. On the other hand, the injected protons and electrons also experience clockwise and anticlockwise magnetic drift movements, the larger the energy of the particles is, the faster the drift velocity will be. Multiple injections will cause a remarforble increase o f the flux of the external radiation belt particles.