The observation of Extensive Air Showers from Space
  We summarise some basic issues relevant to the optimisation and design of space-based experiments for the observation of the Extensive Air Showers produced by Ultra-High Energy Cosmic Particles interacting with the atmosphere. A number of basic relations is derived and discussed with a twofold goal: defining requirements for the experimental apparatus and estimating the exptected performance. 
M. Pallavicini, R. Pesce, A. Petrolini and A. Thea