New analysis of the fraction of observable nights at astronomical sites based on FengYun-2 satellite data
arXiv:2202.06019 · doi:10.1093/mnras/stac408
Abstract
The fraction of observable nights is an essential parameter for selecting astronomical sites. In recent years, meteorological satellite data have played an essential role in recognising and providing statistics of observable nights. We present a method to estimate the fraction of observable nights based on the FengYun-2 series of geostationary meteorological satellites and weather records of multiple astronomical sites. We have calculated the fraction of observable nights at 27 sites in Indonesia and two astronomical sites in China to validate the method. The results derived from our method show good agreement with previous works. Furthermore, we have derived the yearly distribution of the fraction of observable nights above China, which indicates the area near 40N has more observable nights than other areas in China.
arXiv comment9 pages, 5 figures; accepted for publication in MNRAS (Acceptation date: 2022 February 10)
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