Energetic particles fluxes measured by spacecraft in the heliosphere are frequently observed to peak during interplanetary shock crossings, suggesting the shock to be the source of acceleration. It has been shown that the shape of the energetic particle fluxes, upstream and downstream of the shock, is affected by energetic particle transport properties. In this study we make a comparison among a number of shock crossings observed by the ACE spacecraft, and the energetic particle fluxes derived by a test-particle numerical model in the vicinity of a planar shock. We find that observations are in good agreement with a particle density profile obtained in the simulation by assuming superdiffusive transport both upstream and downstream of the shock region.

人们经常观察到由航天器在日球中测量到的高能粒子通量在行星际激波穿越时达到峰值，这表明激波是加速度的来源。已经表明，在冲击的上游和下游，高能粒子通量的形状受高能粒子传输特性的影响。在这项研究中，我们对ACE航天器观测到的多个冲撞交叉点与平面冲击附近的测试粒子数值模型得出的高能粒子通量进行了比较。我们发现，观测结果与通过假设激波区域的上游和下游的超扩散传输而在模拟中获得的颗粒密度分布非常吻合。