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arXiv 1709.08017physics.space-ph
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太阳活动周内日球层银河系宇宙射线的调制

Modulation of Galactic Cosmic Rays in the Inner Heliosphere over Solar Cycles

Z. -N. Shen, G. Qin

摘要:

利用Qin和Shen在2017年开发的数值模式,研究了内日球层中银河系宇宙射线(GCR)的11年和22年调制。基于Parker输运方程的数值解,该模型包括一个修改后的Parker日球磁场,一个局部静态时间延迟日球,和一个随时间变化的扩散系数模型,其中的磁湍流大小的变化的解析表达式,整个内日球层应用。此外,在太阳活动极大期,太阳磁场的极性是随机确定的,出现$A>0$的可能性由太阳北极磁场向外和南极磁场向内的百分比决定。计算结果与几个GCR观测结果进行了比较,例如,IMP 8,SOHO/EPHIN,E100,Voyager 1和2,在不同的能量和显示良好的一致性。结果表明,我们的模型成功地再现了11年和22年调制周期。

英文摘要:

The 11-year and 22-year modulation of galactic cosmic rays (GCRs) in the inner heliosphere are studied using a numerical model developed by Qin and Shen in 2017. Based on the numerical solutions of Parker's transport equations, the model incorporates a modified Parker heliospheric magnetic field, a locally static time delayed heliosphere, and a time-dependent diffusion coefficients model in which an analytical expression of the variation of magnetic turbulence magnitude throughout the inner heliosphere is applied. Furthermore, during solar maximum, the solar magnetic polarity is determined randomly with the possibility of $A>0$ decided by the percentage of the north solar polar magnetic field being outward and the south solar polar magnetic field being inward. The computed results are compared with several GCR observations, e.g., IMP 8, SOHO/EPHIN, Ulysses, Voyager 1 \& 2, at various energies and show good agreement. It is shown that our model has successfully reproduced the 11-year and 22-year modulation cycles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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