SMuK 2023 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 6: Poster
UP 6.3: Poster
Mittwoch, 22. März 2023, 17:30–19:00, HSZ OG1
On the twilight phenomenon of the green band — •Anna Lange1, Alexei Rozanov2, and Christian von Savigny1 — 1Institute of Physics, University of Greifswald, Germany — 2Institute of Environmental Physics, University of Bremen, Germany
The twilight sky is usually characterised by the well-known reddish/orange colours close to the horizon and the blue colours above. However, in many cases a green or greenish band forms between the blue and reddish parts of the sky, and it is essentially not documented in the literature. In this study, the green band phenomenon is simulated using the radiative transfer model SCIATRAN and subsequent colour modelling based on the CIE colour matching functions and chromaticity values. Different parameters and processes that have a potential influence are investigated. In addition, a possible contribution by airglow emissions is discussed. The simulations show that it requires just the right intensities in the blue, green, and long-wave spectral regions to produce a green colour. The total ozone column has the comparatively largest influence. This study is, to the best of our knowledge, the first detailed investigation of the green band phenomenon.