切伦科夫望远镜阵列的太阳/月球光度计-第一批结果
Sun/Moon photometer for the Cherenkov Telescope Array - first results
摘要：
用成像大气切伦科夫技术测定γ光子的能量和通量，强烈依赖于大气的光学性质。因此，在未来的观测切伦科夫望远镜阵列（CTA）的大气监测以及预期的长期监测，以表征大气条件的整体性质和年度变化是非常重要的。为了长期监测大气状况，CTA站点已经安装了几台仪器。其中之一是安装在CTA南部站点的太阳/月亮光度计CE 318-T。由于光度计安装在大气条件非常稳定的地方，它也可用于表征其性能和测试气溶胶光学厚度（AOD）反演，云筛选和校准的新方法。在这项工作中，我们描述了我们的校准方法，夜间测量和修改的云屏蔽夜间AOD检索的目的。我们将这些方法应用于两个月的观测，并给出了AOD在四个光度通带中的分布及其不确定性。
英文摘要：
Determination of the energy and flux of the gamma photons by Imaging Atmospheric Cherenkov Technique is strongly dependent on optical properties of the atmosphere. Therefore, atmospheric monitoring during the future observations of the Cherenkov Telescope Array (CTA) as well as anticipated long-term monitoring in order to characterize overal properties and annual variation of atmospheric conditions are very important. Several instruments are already installed at the CTA sites in order to monitor atmospheric conditions on long-term. One of them is a Sun/Moon photometer CE318-T, installed at the Southern CTA site. Since the photometer is installed at a place with very stable atmospheric conditions, it can be also used for characterization of its performance and testing of new methods of aerosol optical depth (AOD) retrieval, cloud-screening and calibration. In this work, we describe our calibration method for nocturnal measurements and the modification of cloud-screening for purposes of nocturnal AOD retrieval. We applied these methods on two months of observations and present the distribution of AODs in four photometric passbands together with their uncertainties.
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