高能风暴粒子事件中粒子强度的东西不对称性
The East-West Asymmetry of Particle Intensity in Energetic Storm Particle Events
AI总结：
本研究利用iPATH模型分析ESP事件中峰值强度的东西不对称性，发现注入效率是主要影响因素，东侧峰值更高且与注入效率正相关，重离子的不对称性则受能量和荷质比依赖性影响，模型结果与1 au观测相符。
摘要：
我们使用改进的日球层粒子加速与传输（iPATH）模型，研究了高能风暴粒子（ESP）事件中峰值强度的东西不对称性。我们发现，注入效率在日冕物质抛射激波鼻部东侧达到峰值，该处激波呈现准平行几何结构。我们表明，东侧翼的峰值强度通常大于西侧翼，且与注入效率呈正相关。我们还检验了重离子的这种不对称性，它对离子能量非常敏感。模型结果与1 au处ESP事件的测量结果对比显示合理的一致性。我们建议注入效率可能是导致ESP事件中峰值强度东西不对称性的主要因素。此外，最大粒子能量的荷质比（Q/A）依赖性影响重离子的这种不对称性。
英文摘要：
We examine the East-West asymmetry of the peak intensity in energetic storm particle (ESP) events using the improved Particle Acceleration and Transport in the Heliosphere (iPATH) model. We find that injection efficiency peaks east of the nose of coronal mass ejection shock where the shock exhibits a quasi-parallel geometry. We show that the peak intensity at the eastern flank is generally larger than that at the western flank and it positively correlates with the injection efficiency. We also examine this asymmetry for heavy ions, which depends sensitively on the ion energy. Comparison between the modelling results with the measurements of ESP events at 1 au shows a reasonable agreement. We suggest that the injection efficiency can be a primary factor leading to the East-West asymmetry of the peak intensity in ESP events. Additionally, the charge-to-mass (Q/A) dependence of the maximum particle energy affects this asymmetry for heavy ions.
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