EUSO instrument: Concept and solutions

The EUSO (Extreme Universe Space Observatory) telescope is a compact instrument assisted by an Atmospheric Sounding device. The telescope is basically a large-aperture and large Field of View digital camera working on the near UV wavelength (330-400 mn) with high pixelization and fast Multi-Anode detectors operating in single counting mode and charge integration. EUSO phase A study has been successfully completed on July 2004. The project is waiting for a formal decision by the Space Agencies (ESA, NASA, JAXA, ASI) involved to proceed with the phase B study. An overview of the up-to-date configuration of the telescope is reported, with the related description of all the various parts of the Instrument.