粒子与单个或多个3D太阳能重连电流片的相互作用
Particle interactions with single or multiple 3D solar reconnecting current sheets
摘要：
通过数值实验分析了耀斑太阳活动区带电粒子（电子和质子）的加速问题。加速被建模为一个随机过程发生的粒子与局部磁重联网站通过多个步骤的相互作用。研究了两种局部重连拓扑：Harris型和X点。在我们以前的工作中发现的哈里斯型电流片中的最大动能增益的公式，很好地拟合了该过程的单个步骤的数值数据。然后给出了一个概括，通过X点近似的动能增益。在多步过程的情况下，在这两种拓扑结构中，粒子的动能分布被发现在少量步骤之后获得实际不变的形式。对这种倾向进行了理论上的解释。给出了加速过程的其他特性，如平均加速时间和粒子的俯仰角分布。
英文摘要：
The acceleration of charged particles (electrons and protons) in flaring solar active regions is analyzed by numerical experiments. The acceleration is modelled as a stochastic process taking place by the interaction of the particles with local magnetic reconnection sites via multiple steps. Two types of local reconnecting topologies are studied: the Harris-type and the X-point. A formula for the maximum kinetic energy gain in a Harris-type current sheet, found in a previous work of ours, fits well the numerical data for a single step of the process. A generalization is then given approximating the kinetic energy gain through an X-point. In the case of the multiple step process, in both topologies the particles' kinetic energy distribution is found to acquire a practically invariant form after a small number of steps. This tendency is interpreted theoretically. Other characteristics of the acceleration process are given, such as the mean acceleration time and the pitch angle distributions of the particles.
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