Site-testing at the Muztagh-ata Site V.Nighttime Cloud Amount during the Last Five Years

The clarity of nights is the major factor that should be carefully considered for optical/infrared astronomical observatories in site-testing campaigns.Cloud coverage is directly related to the amount of time available for scientific observations at observatories.In this article,we report on the res...

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Published in天文和天体物理学研究 Vol. 23; no. 4; pp. 164 - 171
Main Authors Jing Xu, Guo-jie Feng, Guang-xin Pu, Le-tian Wang, Zi-Huang Cao, Li-Qing Ren, Xuan Zhang, Shu-guo Ma, Chun-hai Bai, Ali Esamdin, Jian Li, Yuan Tian, Zheng Wang, Yong-heng Zhao, Jian-rong Shi
Format Journal Article
LanguageEnglish
Published Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China%National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China%Urumqi Meteorological Satellite Ground Station,Urumqi 830011,China 2023
Subjects
atmospheric effects
site testing
methods:statistical
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Summary:The clarity of nights is the major factor that should be carefully considered for optical/infrared astronomical observatories in site-testing campaigns.Cloud coverage is directly related to the amount of time available for scientific observations at observatories.In this article,we report on the results of detailed night-time cloud statistics and continuous observing time derived from ground-based all-sky cameras(ASCs)at the Muztagh-ata site from 2017 to 2021.Results obtained from acquisition data show that the proportion of the annual observing time at the Muztagh-ata site is 65％,and the best period with the least cloud coverage and longer continuous observing time is from September to February.We made a comparison of the monthly mean observing nights obtained from our ASC and CLARA data set,and results show that the discrepancy between them may depend on the cloud top heights.On average,this site can provide 175 clear nights and 169 nights with at least 4 hr of continuous observing time per year.
ISSN:1674-4527