1992 - 2006年Cerro Tololo美洲天文台的光学天空亮度
Optical Sky Brightness at Cerro Tololo Inter-American Observatory from 1992 to 2006
摘要：
我们提出了光学UBVRI天空亮度的措施，从1992年到2006年。这些数据是基于CTIO 0.9米、1.3米和1.5米望远镜获得的CCD图像。B波段和V波段的数据与以前在莫纳克亚山进行的测量相当一致，尽管根据每年少量的图像，1992年至1994年的数据存在差异。我们基于CCD的数据与在Cerro Paranal获得的值没有显著差异。我们发现，V波段天空亮度的年平均值与天空亮度测量前5天的10.7厘米太阳通量相关性最好。这意味着太阳风的平均速率为350公里/秒。虽然我们可以在地平线以上10度测量拉塞雷纳夜空水平的增强，但在45度以上的仰角，我们没有发现任何证据表明Cerro Tololo的夜空亮度受到附近城镇的人造光的影响。
英文摘要：
We present optical UBVRI sky brightness measures from 1992 through 2006. The data are based on CCD imagery obtained with the CTIO 0.9-m, 1.3-m, and 1.5-m telescopes. The B- and V-band data are in reasonable agreement with measurements previously made at Mauna Kea, though on the basis of a small number of images per year there are discrepancies for the years 1992 through 1994. Our CCD-based data are not significantly different than values obtained at Cerro Paranal. We find that the yearly averages of V-band sky brightness are best correlated with the 10.7-cm solar flux taken 5 days prior to the sky brightness measures. This implies an average speed of 350 km/sec for the solar wind. While we can measure an enhancement of the night sky levels over La Serena 10 degrees above the horizon, at elevation angles above 45 degrees we find no evidence that the night sky brightness at Cerro Tololo is affected by artificial light of nearby towns and cities.
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