History - swiss-birdradar.com

... air-speeds were calculated from wind and bird tracks (Bruderer 1971, Bruderer & Steidinger 1972 ... . 1972, Bruderer & Neusser 1982). 1981-1990 Radar studies in and around the Alps (Bruderer 1996 ... from wind and bird tracks (Bruderer 1971, Bruderer & Steidinger 1972). – Echo-signatures were recorded ... day and night into the radar beam (Bruderer et al. 1972, Bruderer & Neusser 1982). 1981-1990 Radar ...