The book summarizes international progress over the last few decades in upper atmosphere airglow research. Measurement methods, theoretical concepts and empirical models of a wide spectrum of upper atmospheric emissions and their variability are considered. The book contains a detailed bibliography of studies related to the upper atmosphere airglow and a lot of useful information on emission characteristics and its formation processes. The book is of interest to scientists working in the field of aeronomy, physics of the upper atmosphere of the Earth as well as the other planets, and also for experts interested in applied aspects of the Earth's upper atmospheric emissions.