Comparison of the scintillation noise above different observatories measured with MASS instruments
Comparison of the scintillation noise above different observatories measured with MASS instruments
复制标题
MASS仪器测量的不同天文台上方闪烁噪声的比较
DOI：
10.1051/0004-6361/201219954
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发表时间：
2012
影响因子：
6.5
通讯作者：
O. Voziakova
中科院分区：
文献类型：
--
作者：
V. Kornilov;M. Sarazin;A. Tokovinin;T. Travouillon;O. Voziakova
目标。闪烁噪音是地面光度测量精度的主要限制。
方法.利用MASS仪器在全球11个天文观测点收集的大量恒星闪烁数据，对大型望远镜在快速测光和传统长曝光条件下的闪烁噪声进行了估算。
结果给出了相应参数的统计分布。闪烁噪声主要由高层大气中的湍流和风决定，在所有地点都是可比的，莫纳克亚山的值略低，智利的托隆查尔噪声最高。我们表明，经典的杨氏公式低估了闪烁噪声。闪烁噪声的时间变化在所有地点也是相似的，在1 - 2小时的时间尺度上显示出短期变化，而变化较慢，包括明显的季节性趋势（当地冬季闪烁较强，天空较不晴朗）。在附近的天文台之间发现了一些相关性。
Aims. Scintillation noise is a major limitation of ground-based photometric precision.
Methods. An extensive dataset of stellar scintillation collected at 11 astronomical sites world-wide with MASS instruments was used to estimate the scintillation noise of large telescopes in the fast photometry and traditional long-exposure regime.
Results. Statistical distributions of the corresponding parameters are given. The scintillation noise is mostly determined by turbulence and wind in the upper atmosphere and is comparable at all sites, with slightly lower values at Mauna Kea and the highest noise at Tolonchar in Chile. We show that the classical Young’s formula underestimates the scintillation noise. The temporal variations of the scintillation noise are also similar at all sites, showing short-term variability at time scales of 1 − 2 h and slower variations, including marked seasonal trends (stronger scintillation and less clear sky during local winter). Some correlation was found between nearby observatories.