The effect of spatial and spectral heterogeneity of ground-based light sources on night-sky radiances

摘要: Nowadays, light pollution is a permanent problem at many observatories around the world. Elimination of excessive lighting during night not only about reduction total luminous power ground-based sources, but also involves experimenting with spectral features single lamps. Astronomical photometry typically made specific wavelengths, and thus analysis effects highly important. Nevertheless, studies on behaviour are quite rare. Instead, broadband or integral quantities (such as sky luminance) preferentially measured modelled. The knowledge night-light spectra necessary for proper interpretation narrowband data. In this paper, night-sky radiances in nominal lines B (445 nm) V (551 filters determined numerically under clear-sky conditions. Simultaneously, corresponding sky-luminance patterns computed compared against radiances. It shown that spectra, distances most important sources (towns) surrounding an observatory essential determining levels. addition, optical characteristics local atmosphere can change angular radiance luminance. All these evaluated two Slovakian observatories: Star´ aL esn´ Vartovka.