SCATTTERING OF HIGH-ENERGY PARTICLES AT A COLLISIONLESS SHOCK FRONT: DEPENDENCE ON THE SHOCK ANGLE
SCATTTERING OF HIGH-ENERGY PARTICLES AT A COLLISIONLESS SHOCK FRONT: DEPENDENCE ON THE SHOCK ANGLE
复制标题
高能粒子在无碰撞激波前沿的散射：对激波角度的依赖性
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Kartavykh
中科院分区：
文献类型：
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作者：
M. Gedalin;W. Dröge;Y. Kartavykh
许多激波加速理论处理的是仅取决于粒子能量和俯仰角的回转相位平均粒子分布。扩散激波加速包括激波穿越作为一个必要的组成部分。只要激波宽度比粒子的平均自由程小得多，这种穿越就受过渡层内部宏观场的控制。高能粒子在这些场中的动力学是非绝热的和依赖于回转相位的。磁矩在很宽的激波角范围内不守恒，反射条件也不是由磁瓶关系决定的。相反，对于入射粒子的俯仰角和未知的回转相位，存在有限的反射概率。该概率在很宽的俯仰角范围内在零和1之间变化。在这项工作中，我们研究如何在冲击波阵面的匹配条件可以修改与陀螺相位依赖考虑，例如，以散射概率的形式。
Many shock acceleration theories deal with gyrophase-averaged particle distributions that depend only on the energy and pitch angle of the particles. Diffusive shock acceleration includes shock crossing as a necessary component. As long as the shock width is much smaller than the mean free path of a particle, the crossing is governed by the macroscopic fields inside the transition layer. The dynamics of high-energy particles in these fields is non-adiabatic and gyrophase dependent. The magnetic moment is not conserved in a wide range of shock angles, nor is the condition of reflection determined by the magnetic bottle relation. Instead, for a pitch angle and unknown gyrophase of an incident particle there is a finite probability of reflection. This probability varies between zero and unity in a wide range of pitch angles. In this work we investigate how the matching conditions at the shock front could be modified with the gyrophase dependence taken into account, e.g., in the form of the scattering probabilities.