A review of thunderstorm electrification processes

Abstract

Recent developments in the area of thunderstorm electrification processes are reviewed. These processes have two main divisions: a) convection, in which particles charged by ion capture are moved by convection currents to strengthen the electric field in the cloud, and b) processes involving charge transfer during particle interactions, following which oppositely charged particles move apart in the updraft to form the observed charge centers. Type-b processes are further subdivided into inductive (relying on the preexistence of an electric field) and noninductive charge-transfer mechanisms. Field and laboratory evidence points to the importance of interactions between particles of the ice phase, in the presence of liquid water droplets, in separating electric charge in thunderstorms. -from Author