基于一维随机输运模型的银河宇宙射线调制研究

Modulation of galaxy cosmic rays with 1D stochastic transport model

本文运用随机微分方程方法,求解宇宙射线在日球层内的一维输运方程,基于太阳活动对银河宇宙射线含时扩散系数κrr的影响,计算O^(8+)粒子在地球位置的能谱,模拟了太阳活动对银河宇宙射线的调制效应.其中包括,利用κrr余弦含时变化,模拟了宇宙射线的11年周期及其滞后效应;利用κrr的线性变化函数,模拟了一次福布斯下降事件中的粒子通量曲线.

In this paper,the one-dimensional transport equation of galactic cosmic rays（ GCRs） in the heliosphere was solved by the stochastic differential method. Based on the time-dependent diffusion coefficient κrrof GCRs,the energy spectrums of O8 ＋near the Eearth were calculated,for the study of the solar modulation of GCRs. Using the time-dependent κrrof cosine function,the 11 years periodicity and the hysteresis effect of GCRs were simulated.Based on a linear response function of κrr,the particle flux profile of a Forbush Decrease（ FD） event was simulated.