This book investigates elementary processes in the Earth s atmosphere involving photons, electrons, ions, radicals, and aerosols. It is based on global atmospheric models such as the standard atmospheric model with averaged atmospheric parameters across the globe and over time, the Earth s energetic balance, and the global electric circuit that allows to analyze fundamental atmospheric properties to be analyzed. Rate constants of elementary processes in the Earth s atmosphere, together with measured atmospheric parameters and existing concepts of atmospheric phenomena, are used in...