拉帕尔马和格雷厄姆山观测站晴空部分的分析
Analysis of the fraction of clear sky at the La Palma and Mt Graham sites
摘要：
可用望远镜时间的分数是选择影响地基望远镜性能的天文台址的最重要要求之一。利用地面和卫星资料对拉帕尔马和格雷厄姆山的云覆盖进行了定量调查。这项工作的目的是推导出清晰的夜晚的卫星红外通道和验证的结果，使用地面观测。在拉帕尔马，我们发现从地面和71.9%的卫星上获得的晴朗夜晚的平均百分比为62.6%。考虑到普通夜晚的比例，我们发现地面和卫星的晴朗夜晚一致率为80.7%。在格雷厄姆山，我们发现哥伦拜恩日像仪和夜间观测日志之间有97%的一致性。从Columbine日像仪和TOMS-OMI卫星，我们发现了大约45%的晴朗夜晚，而卫星数据（GOES，TOMS）比La Palma的更分散。设置一个统计阈值，我们重试日像仪和卫星之间的可比季节趋势。
英文摘要：
The fraction of available telescope time is one of the most important requirements for selecting astronomical sites affecting the performance of ground based telescopes. A quantitative survey of clouds coverage at La Palma and Mt.Graham is presented using both ground and satellite based data. The aim of this work is deriving clear nights for the satellite infrared channels and verifying the results using ground based observations. At La Palma we found a mean percentage of clear nights of 62.6% from ground and 71.9% from satellite. Taking into account the fraction of common nights we found a concordance of 80.7% clear nights from ground and satellite. At Mt.Graham we found a 97% of agreement between Columbine heliograph and night time observing log. From Columbine heliograph and TOMS-OMI satellite we found about 45% of clear nights, while satellite data (GOES, TOMS) are much more dispersed than those ones of La Palma. Setting a statistical threshold we retried a comparable seasonal trend between heliograph and satellite.
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