Monitoring Long-Term Trends in the Anthropogenic Night Sky Brightness

Salvador Bará, Raul C. Lima and Jaime Zamorano
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Salvador Bará: Departmento Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia
Raul C. Lima: Physics, School of Health of the Polytechnic Institute of Porto, 4200-072 Porto, Portugal
Jaime Zamorano: Departamento de Física de la Tierra y Astrofísica, Instituto de Física de Partículas y del Cosmos (IPARCOS), Universidad Complutense de Madrid, 28040 Madrid, Spain

Sustainability, 2019, vol. 11, issue 11, 1-14

Abstract: Monitoring long-term trends in the evolution of the anthropogenic night sky brightness is a demanding task due to the high dynamic range of the artificial and natural light emissions and the high variability of the atmospheric conditions that determine the amount of light scattered in the direction of the observer. In this paper, we analyze the use of a statistical indicator, the m FWHM , to assess the night sky brightness changes over periods of time larger than one year. The m FWHM is formally defined as the average value of the recorded magnitudes contained within the full width at half-maximum region of the histogram peak corresponding to the scattering of artificial light under clear skies in the conditions of a moonless astronomical night (sun below −18°, and moon below −5°). We apply this indicator to the measurements acquired by the 14 SQM detectors of the Galician Night Sky Brightness Monitoring Network during the period 2015–2018. Overall, the available data suggest that the zenithal readings in the Sky Quality Meter (SQM) device-specific photometric band tended to increase during this period of time at an average rate of +0.09 mag SQM /arcsec 2 per year.

Keywords: light pollution measurement; radiometry; photometry; environmental monitoring; sky brightness (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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