姚安天文观测站的夜间红外云量特征分析

发布时间：2019-05-23 07:30

【摘要】：云对天文观测具有重要影响,云量是衡量天文台址质量的重要指标.位于姚安天文观测站的红外云量仪,用于获取实时的全天高空间分辨率云图.结合空间碎片的实际观测,严格按照天文夜对累积1yr(2015-08-01—2016-07-31)的夜间云量数据进行统计和分析.姚安站的年平均夜间云量为4.42成,年天文可用夜为236个,其中测光夜98个,半测光夜44个,光谱夜94个.云量具有明显的两季特征:5月至10月间为雨季,云量显著增多,其中7月份观测条件最差;11月至次年4月为旱季,云量较少,每月的天文可用夜均在23个以上,其中1月份的测光夜最多,3月份的天文可用夜最多.结合云层对天文观测的威胁程度,统计不同云量的总时间和每月的云量分布情况,评估观测站的气象条件,为合理安排观测计划提供参考.
[Abstract]:Clouds have an important influence on astronomical observation, and cloud cover is an important index to measure the quality of astronomical stations. The infrared cloud meter located at Yao'an Astronomical observation Station is used to obtain real-time all-day high spatial resolution cloud images. Combined with the actual observation of space debris, the nocturnal cloud cover data of cumulative 1yr (2015 / 08 / 01 / 2016 / 07 / 31) were counted and analyzed strictly according to astronomical night. The average annual night cloud cover of Yao'an station is 4.42%, and the number of annual astronomical available nights is 236, including 98 photometric nights, 44 semi-photometric nights and 94 spectral nights. The cloud cover has two obvious seasonal characteristics: from May to October, the rainy season is the rainy season, and the cloud cover increases significantly, among which the observation conditions are the worst in July. November to April of the following year is a dry season, the clouds are less, the monthly astronomical available nights are more than 23, of which the largest number of photometric nights in January, and the largest number of astronomical nights available in March. Combined with the threat degree of cloud layer to astronomical observation, the total time of different cloud cover and the distribution of cloud cover per month are counted, and the meteorological conditions of the observation station are evaluated, which provides a reference for the reasonable arrangement of observation plan.
【作者单位】：中国科学院紫金山天文台;中国科学院空间目标与碎片观测重点实验室;中国科学院大学;
【基金】：中国科学院国防科技创新基金项目(CXJJ-14-S106)资助
【分类号】：P112

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