基于Green函数法的太阳高能粒子行星际扩散过程模拟

统计分析了自1976-2017年期间记录到的217次SEP(Solar Energetic Particle)事件的日冕足点经度位置,其分布特征符合日冕横向分布的东西效应,同时基于两相传输模型及其Green函数解,对发生在不同日冕足点的四次SEP事件进行了模拟研究.模拟与观测结果表现一致,表明该模型能够较好地模拟发生在...

Simulation of the Diffusion Processes of Solar Energetic Particle Events Based on the Green Functional Theory

In order to investigate the diffusion processes of Solar Energetic Particle (SEP) events, four SEP events with different coronal-foot-point longitudes are simulated based on the two-phase model proposed by Huang et al. The simulations agree with the observations from GOES satellites, indicating that the model has wide applicability. Sensitivity tests for multiple transmission parameters in the model show that the change of the longitude of the coronal foot point affects the detection time and peak value of the observations, and the change of the solar wind speed has different influencing mechanisms to the SEP events with different coronal-foot-point longitudes. Furthermore, it can be found that the transverse diffusion coefficient of the corona area is associated with the diffusion processes of SEP events along the solar surface, and mainly affects the intensity of the event. Different radial diffusion coefficients mainly change the arrival time of the events, and it plays a more effective role in the diffusion of SEP events in comparison with the lateral diffusion coefficient, since the SEP events mainly transmit along the interplanetary magnetic field. In addition, the escape time that manifests the average lifetime of the SEP source or the time window for the outflow of SEPs from the solar activity, has the least effect on the simulations in comparison with the other parameters.