Natural Night Sky Brightness during Solar Minimum
Natural Night Sky Brightness during Solar Minimum
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DOI：
10.3847/1538-3881/abfdaa
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发表时间：
2021-07-01
影响因子：
5.3
通讯作者：
Mallorquin, Manuel
中科院分区：
文献类型：
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作者：
Alarcon, Miguel R.;Serra-Ricart, Miquel;Mallorquin, Manuel
2018年，第24太阳周期进入太阳活动极小期。在此期间，在地球上不同的黑暗地点收集了1100万个天顶夜空亮度(NSB)数据，包括天文台和自然保护区，使用相同的宽带望远镜编码器和天空传感器测光仪(基于Unihedron Sky Quality Meter TLS237传感器)。为了避免太阳、月亮、云和其他天文来源(银河系和黄道光)的增亮效应，对影响NSB测量的多种效应进行了详细的观测审查，设计了最佳滤光片。通过应用这些新滤光片，从44个不同光度计的百分位数计算出了自然NSB。测得原始夜空的变化幅度为0.1mag/arcsec(2)，这可能是由于NSB在长达几个月的尺度上的变化，并与半年一次的振荡相适应。我们报告了在绝大多数夜晚对NSB的短时间变化的系统观测，发现这些变化与在中间层上方形成的气辉事件有关。
In 2018, Solar Cycle 24 entered into a solar minimum phase. During this period, 11 million zenithal night sky brightness (NSB) data were collected at different dark sites around the planet, including astronomical observatories and natural protected areas, with identical broadband Telescope Encoder and Sky Sensor photometers (based on the Unihedron Sky Quality Meter TLS237 sensor). A detailed observational review of the multiple effects that contribute to the NSB measurement has been conducted with optimal filters designed to avoid brightening effects by the Sun, the Moon, clouds, and other astronomical sources (the Galaxy and zodiacal light). The natural NSB has been calculated from the percentiles for 44 different photometers by applying these new filters. The pristine night sky was measured to change with an amplitude of 0.1 mag/arcsec(2) in all the photometers, which is suggested to be due to NSB variations on scales of up to months and to be compatible with semiannual oscillations. We report the systematic observation of short-time variations in NSB on the vast majority of the nights and find these to be related to airglow events forming above the mesosphere.