在季节和日效应分解假设下估算cosmic ray探测器曝光天空图
Estimating a cosmic ray detector exposure sky map under the hypothesis of seasonal and diurnal effects factorization
摘要：
测量高能宇宙射线到达方向上的大尺度图案或各向异性是理解其起源的重要一步。这种测量依赖于对探测器在天空每个方向上的相对曝光的准确估计：覆盖图。为了达到在百分之一水平以下的该图的确定的准确度，必须正确地识别和校正可能引起作为时间的函数的探测器曝光的变化的所有环境影响。在一种方法中，类似于反恒星时间分析中使用的方法，我们提出了一种方法来经验估计和校正这些影响的假设下，季节和昼夜变化可以分解。我们测试了这种方法使用模型地面探测器的宇宙射线空气簇射，其孔径变化，由于依赖于大气条件的空气簇射发展。
英文摘要：
The measurement of large scale patterns or anisotropies in the arrival direction of high energy cosmic rays is an important step towards the understanding of their origin. Such measurements rely on an accurate estimation of the detector relative exposure in each direction on the sky : the coverage map. To reach an accuracy on the determination of this map below the one percent level one must properly identify and correct for all the environmental effects that may induce variations in the detector exposure as a function of time. In an approach, similar to the one used in anti-sidereal time analysis, we propose a method to empirically estimate and correct for those effects under the hypothesis that seasonal and diurnal variations can be factorized. We tested this method using a model ground detector of cosmic ray air showers, whose aperture varies due to the dependence of the air shower development on the atmospheric conditions.
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