论文标题
具有AMS-02的宇宙质子和氦气的太阳调制
Solar modulation of cosmic proton and helium with AMS-02
论文作者
论文摘要
我们研究了由AMS-02在2011年5月至2017年5月之间通过AMS-02测量的长时间宇宙射线质子和氦光谱的长时间宇宙调制效果。时间跨度涵盖了负地球层磁场循环，极性逆转周期，极性逆转周期和正极周期。 AMS-02观测数据的前所未有的准确性为提高对时间依赖太阳调制效果的理解提供了一个很好的机会。在这项工作中，使用二维太阳能调制模型来计算地球层中宇宙射线的传播。该模型的一些重要成分反映了全球地球环境的观察结果。使用耻骨太阳能代码在数值上求解传播方程。我们发现，在高太阳能活动期间抑制了漂移效应，但在2017年上半年几乎恢复了。平均自由路径的时间依赖性刚度依赖性对于重现2012年8月至2015年10月之间的观察结果至关重要。
We investigate the solar modulation effect with the long time cosmic ray proton and helium spectrum measured by AMS-02 on the time scale of a Bartels rotation (27 days) between May 2011 and May 2017. The time-span covers the negative heliospheric magnetic field polarity cycle, the polarity reversal period and the positive polarity cycle. The unprecedented accuracy of AMS-02 observation data provide a good opportunity to improve the understanding of the time dependent solar modulation effect. In this work, a two-dimensional solar modulation model is used to compute the propagation of cosmic rays in the heliosphere. Some important ingredients of the model which reflect the global heliospherical environment are taken from the observations. The propagation equation is numerically solved with the pubic Solarprop code. We find that the drift effect is suppressed during the high solar activity period but nearly recovered in the first half of 2017. The time-dependent rigidity dependence of the mean free path is critical to reproduce the observations between August 2012 and October 2015.
