墨西哥城中子监测器观测到的地球轨道运动对cosmic ray流的康普顿-Getting效应
Compton-Getting effect due to terrestrial orbital motion observed on cosmic ray flow from Mexico-city Neutron Monitor
摘要：
我们使用墨西哥城中子监测器（NM）探测器，由于地球的轨道运动和康普顿-Getting（C-G）在1935年预测的宇宙射线流的昼夜各向异性，作为一阶相对论效应。墨西哥城NM的地理纬度不是很高（$19.33^{\circ}$ N），它有一个高截止地磁刚度（8.2 GV）和海拔（2274米asl）有利于观察的C-G效应。此外，在太阳活动周极小期，银河宇宙线通量最大，太阳磁场减弱，呈现偶极型。它对到达地球的宇宙射线的影响是最小的。根据墨西哥城NM的数据，对2008年和2019年两个太阳极小期期间的组合计数率进行分析，得出C-G效应的振幅变化为（0.043 $\pm$ 0.019）\%，相位为（6.15 $\pm$ 1.71）LT。预期的振幅变化为0.044\%，相位为6.00 LT。
英文摘要：
We look for a diurnal anisotropy in the cosmic ray flow, using the Mexico-City Neutron Monitor (NM) detector, due to the Earth's orbital motion and predicted by Compton-Getting (C-G) in 1935, as a first-order relativistic effect. The Mexico-City NM's geographic latitude is not very high ($19.33^{\circ}$N), and it has a high cutoff geomagnetic rigidity (8.2 GV) and mountain altitude (2274 m asl) favoring the observation of the C-G effect. Furthermore, during the solar cycle minima, the galactic cosmic ray flux is maxima, and the solar magnetic field gets weakened, with a dipolar pattern. Its influence on cosmic rays reaching Earth is the smallest. Analysis of the combined counting rate during two solar minima, 2008 and 2019, from Mexico-city NM's data yields the C-G effect with an amplitude variation of (0.043$\pm$ 0.019)\%, and phase of (6.15$\pm$ 1.71) LT. The expected amplitude variation is 0.044\%, and the phase of 6.00 LT.
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