to the Alfred Wegener Institute in Potsdam via Internet, where physicist Dr. Christoph Ritter analyzes it in detail. Lidar hatch: The laser beam leaves the observatory (Photo: Alfred-Wegener-Institut) Some [...] and are detected by photo multiplier tubes (PMT) (Photo: Alfred-Wegener-Institut) The control software records the data (Photo: Alfred-Wegener-Institut) [...] AWIPEV observatory towards the clear sky. This beam belongs to a LIDAR system, runned by the Alfred-Wegener-Institute in Potsdam for more than 25 years. With this instrument scientists investigate the atmosphere