in Ny-Ålesund, Spitsbergen) Pyranometer in Ny-Ålesund. (Photo: Alfred-Wegener-Institut) Ny-Ålesund is situated 78.9° N north of the arctic circle. During the polar night from 24. october to 18. february [...] mean values from radiation measurements 1992 to 2024 (Graphic: Alfred-Wegener-Institut) Climate Change and Radiation The shortwave solar radiation and its reflection at the Earth's surface, as well as [...] reflective and downward shortwave radiation in Ny-Ålesund. (Graphic: Alfred-Wegener-Institut) Publication The surface radiation measurements and related climate aspects are discussed in: Maturilli, M., A.