论文标题
帕克太阳探针观察到的太阳能粒子事件的模拟太阳能粒子事件
Simulation of the Solar Energetic Particle Event on 2020 May 29 Observed by Parker Solar Probe
论文作者
论文摘要
本文介绍了由数据驱动的冠状质量射血（CME）冲击产生的太阳能颗粒（SEP）的随机三维（3D）集中的转运模拟，该冠状电场通过数据驱动的模型传播了冠状和地球磁场模型。使用后震后超太阳风离子的扩散冲击加速器处理CME冲击处的SEP。时间向后随机模拟来求解传输方程，以在任何位置，能量和螺距角度获得SEP时间强度的轮廓。该模型将于2020年5月29日应用于Sep事件，当时距离Sun约0.33 au时，立体声A被立体声A和Parker太阳能探针（PSP）观察到。 SEP事件与非常慢的CME相关联，高度为337 km/s的高度低于6 $ \ rm rm r_s $，如SOHO/LASCO CME目录中报道。我们计算粒子通量在PSP和Stereo-A位置的时间曲线，并估算了质子能谱的光谱指数，用于2至16 MeV之间的能量，以及首次到达SEPS经历的磁场线的等效路径长度。我们发现仿真结果与观察结果很好地相关。 SEP事件可以通过颗粒的加速度通过低太阳能电晕中的弱CME冲击来解释，而CME冲击没有磁性连接到观察者。
This paper presents a stochastic three-dimensional (3D) focused transport simulation of solar energetic particles (SEPs) produced by a data-driven coronal mass ejection (CME) shock propagating through a data-driven model of coronal and heliospheric magnetic fields. The injection of SEPs at the CME shock is treated using diffusive shock acceleration of post-shock superthermal solar wind ions. A time backward stochastic simulation is employed to solve the transport equation to obtain the SEP time-intensity profile at any location, energy, and pitch angle. The model is applied to a SEP event on 2020 May 29, observed by STEREO-A close to 1 au and by Parker Solar Probe (PSP) when it was about 0.33 au away from the Sun. The SEP event was associated with a very slow CME with a plane-of-sky speed of 337 km/s at a height below 6 $\rm R_S$ as reported in the SOHO/LASCO CME catalog. We compute the time profiles of particle flux at PSP and STEREO-A locations, and estimate both the spectral index of the proton energy spectrum for energies between 2 and 16 MeV and the equivalent path length of the magnetic field lines experienced by the first arriving SEPs. We found that the simulation results are well correlated with observations. The SEP event could be explained by the acceleration of particles by a weak CME shock in the low solar corona that is not magnetically connected to the observers.
