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A technician of the atmospheric observatory of the AWIPEV research station prepares a measuring flight with a captive balloon during the polar night in Ny-Alesund on Spitsbergen, Norway, 09 April 2015. Since 2003, German and French researchers have been working in the research station AWIPEV in the former miner settlements on the Svalbard archipelago. The observation of the arctic stratosphere and investigations of the life in and around the Arctic Sea by oceanographers, ocean geologists, and arctic physics are scientific work fields of the Koldewey station. Photo: Jens Büttner | usage worldwide (KEYSTONE/DPA/Jens Büttner)