Ground Based Projects CALLISTO CALLISTO (Compound Astronomical Low cost Low frequency Instrument for Spectroscopy and Transportable Observatory). CAM Sprite The aim of this project is to train students in the problems associated with the observation of Transient Luminous Events (TLEs). PEPSO The PEPSO installation consists in simulating a space environment on the ground to test instruments, nanosatellite platforms, and the interactions between the two. Planeterrella Planeterrella is a device that allows to produce phenomena reminiscent of space plasmas such as polar auroras on a small scale. Centre national d'études spatialesUniversité d'OrléansCentre National de la Recherche Scientifique