The JEM-EUSO time synchronization system

Abstract JEM-EUSO is a wide-angle refractive UV-telescope proposed to be attached on International Space Station. The tracks generated by Extensive Air Showers (EAS) produced by Ultra High Energy Cosmic Rays (UHECR) are reconstructed registering the data coming from 4932 MAPMTs of 64-pixels and retrieving the interesting ones on the occurrence of second level triggers. To guarantee correct time alignment of the events and to measure the event time with a precision of few microseconds, a time synchronization system for the focal surface electronics has been developed. Here we will present the status and the technical solutions adopted so far