arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10671astro-ph.SR
收藏

用Fokker-Planck动力学理论模拟耀斑中非热粒子的输运

Modeling the Transport of Nonthermal Particles in Flares Using Fokker-Planck Kinetic Theory

Joel C. Allred, Meriem Alaoui, Adam F. Kowalski, Graham S. Kerr

摘要:

我们描述了一种新的方法来模拟耀斑期间加速的高能粒子的运输,从加速区在太阳日冕,直到他们最终热化在耀斑的足迹。我们的技术数值求解福克-普朗克方程,并包括相应的库仑碰撞在一个通量环与非均匀电离,同步辐射反应,磁镜和回流电场的力量。我们的福克-普朗克方程的解包括二阶俯仰角和动量扩散。它适用于任意质量和电荷的粒子。通过跟踪碰撞,我们预测了这些粒子与周围恒星大气相互作用时产生的韧致辐射。这可以直接与观测结果进行比较,并用于约束加速粒子的能量分布。我们将我们的数字代码命名为FP,并将其分发供一般使用。我们证明了它的有效性在几个测试案例。

英文摘要:

We describe a new approach for modeling the transport of high energy particles accelerated during flares from the acceleration region in the solar corona until their eventual thermalization in the flare footpoint. Our technique numerically solves the Fokker-Planck equation and includes forces corresponding to Coulomb collisions in a flux loop with nonuniform ionization, synchrotron emission reaction, magnetic mirroring and a return current electric field. Our solution to the Fokker-Planck equation includes second-order pitch angle and momentum diffusion. It is applicable to particles of arbitrary mass and charge. By tracking the collisions, we predict the bremsstrahlung produced as these particles interact with the ambient stellar atmosphere. This can be compared directly with observations and used to constrain the accelerated particle energy distribution. We have named our numerical code FP and have distributed it for general use. We demonstrate its effectiveness in several test cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑