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Author  |
Kocifaj, M.; Posch, T.; Solano Lamphar, H.A. |
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Title |
On the relation between zenith sky brightness and horizontal illuminance |
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Journal Article |
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Year |
2015 |
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Monthly Notices of the Royal Astronomical Society |
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MNRAS |
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446 |
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2895–2901 |
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Keywords |
Skyglow; scattering; atmospheric effects; light pollution; numerical methods |
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Abstract |
The effects of artificial light at night are an emergent research topic for astronomers, physicists, engineers and biologists around the world. This leads to a need for measurements of the night sky brightness (= diffuse luminance of the night sky) and nocturnal illuminance. Currently, the most sensitive light meters measure the zenith sky brightness in mag_V/arcsec^2 or – less frequently – in cd/m^2. However, the horizontal illuminance resulting only from the night sky is an important source of information that is difficult to obtain with common instruments. Here we present a set of approximations to convert the zenith luminance into horizontal illuminance. Three different approximations are presented for three idealized atmospheric conditions: homogeneous sky brightness, an isotropically scattering atmosphere and a turbid atmosphere. We also apply the resulting conversion formulae to experimental data on night sky luminance, obtained during the past three years. |
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Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina, 842 48 Bratislava, Slovak Republic |
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Royal Astronomical Society |
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IDA @ john @ |
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1076 |
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