Over the last decades Doppler radar systems have been instrumental to improve our understanding and monitoring capabilities of phenomena and processes taking place in the low, middle, and upper atmosphere. Weather radars, wind profilers, and incoherent and coherent scatter radars implementing Doppler techniques are now used routinely both in research and operational applications by scientists and practitioners. This book brings together a collection of essays by international leading authors devoted to different applications of ground based Doppler radars