Abstract
Sky glow presents itself as a background luminance over the sky, against which the astronomical objects are to be observed. The interference of astronomical observations is caused by the resulting reduction in luminance contrast. A value that is often used for the practical minimum of the natural background radiation is 21,6 magnitude per square arcsecond, corresponding to 3,52.10-4 cd/m2. Several effects from outside the earth atmosphere as well as from within the atmosphere contribute to the natural background radiation. A major contribution to the natural sky brightness comes from the influence of the Sun. As the solar radiation changes during the well-known 11-year period, the influence on the natural sky brightness varies as well.
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Narisada, K., Schreuder, D. (2004). What is light pollution?. In: Light Pollution Handbook. Astrophysics and Space Science Library, vol 322. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2666-9_3
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