A study of the solar modulation of galactic cosmic rays and the origin of cosmic particles and anti-particles using stochastic differential equations

我们建立了对应于Parker型和Fisk型日球层磁场的模型，包括合成电流片。我们已经开发了一个基于耦合随机微分方程的全3D模拟代码，它允许我们研究银河系宇宙线太阳调制的电荷相关性。我们很好地再现了质子强度22年的周期性，但未能定量地再现反质子与质子比率的时间变化。Bess和Pamela实验所观察到的正电子比随不同极性HMF的能量依赖关系被我们用Fisk型HMF模型很好地再现了。

We have built models of heliospheric magnetic field (HMF) corresponding to Parker-type and Fisk-type HMF including resultant current sheets. We have developed a fully 3D simulation code based on a coupled stochastic differential equations which allows us to investigate charge dependence of the solar modulation of galactic cosmic rays. The 22-year periodicity of the intensity of protons was reproduced nicely, however, we failed in reproducing quantitatively the time variation of the anti-proton to proton ratios. The energy dependence of positron to electron ratios observed by BESS and PAMELA experiment during different polarity of HMF is reproduced well by our model with Fisk-type HMF.