THE TEMPERATURE EFFECT IN SECONDARY COSMIC RAYS (MUONS) OBSERVED AT THE GROUND: ANALYSIS OF THE GLOBAL MUON DETECTOR NETWORK DATA
THE TEMPERATURE EFFECT IN SECONDARY COSMIC RAYS (MUONS) OBSERVED AT THE GROUND: ANALYSIS OF THE GLOBAL MUON DETECTOR NETWORK DATA
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DOI：
10.3847/0004-637x/830/2/88
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发表时间：
2016-10-20
影响因子：
4.9
通讯作者：
Sabbah, I.
中科院分区：
文献类型：
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作者：
de Mendonca, R. R. S.;Braga, C. R.;Sabbah, I.
对地球表面μ子探测器观测到的宇宙线强度变化的分析，可以帮助我们理解天体物理、太阳、行星际和地磁现象。然而，在将宇宙射线强度变化与地外现象进行比较之前，有必要考虑温度效应等大气效应。在这项工作中，我们分析了全球μ子探测器网络（GMDN），这是由四个地面探测器，两个在北方半球和两个在南半球的影响。总的来说，我们发现位于北方的探测器受到较高温度的影响。此外，我们注意到，在地面和最大μ子产生的高度上观测到的季节温度变化在所有GMDN位置（低纬度地区）都是反相的。这样，与高纬度地区的预期相反，夏季发生的地面μ子强度下降将与温度效应的两个部分（负和正）有关。分析了几种描述宇宙线强度温度效应的方法。我们发现，质量加权法是一个最好的再现GMDN探测器观察到的宇宙射线的季节性变化，并允许最高的相关性与长期变化的宇宙射线强度中子监测器。
The analysis of cosmic ray intensity variation seen by muon detectors at Earth's surface can help us to understand astrophysical, solar, interplanetary and geomagnetic phenomena. However, before comparing cosmic ray intensity variations with extraterrestrial phenomena, it is necessary to take into account atmospheric effects such as the temperature effect. In this work, we analyzed this effect on the Global Muon Detector Network (GMDN), which is composed of four ground-based detectors, two in the northern hemisphere and two in the southern hemisphere. In general, we found a higher temperature influence on detectors located in the northern hemisphere. Besides that, we noticed that the seasonal temperature variation observed at the ground and at the altitude of maximum muon production are in antiphase for all GMDN locations (low-latitude regions). In this way, contrary to what is expected in high-latitude regions, the ground muon intensity decrease occurring during summertime would be related to both parts of the temperature effect (the negative and the positive). We analyzed several methods to describe the temperature effect on cosmic ray intensity. We found that the mass weighted method is the one that best reproduces the seasonal cosmic ray variation observed by the GMDN detectors and allows the highest correlation with long-term variation of the cosmic ray intensity seen by neutron monitors.