Mechanisms that accelerate Ultra High Energy Cosmic

Abstract: The origin of Ultra-high Energy Cosmic Rays (UHECRs) is still unidentified. Since, at such high energies, the cosmic ray flux is extremely small, a detector with huge observation area is needed. JEM-EUSO is a novel observatory that will be located at the International Space Station to observe Extensive Air Showers (EAS) produced by UHECRs in the Earth’s atmosphere. An advantage of a space based telescope is that also observation is possible under certain cloudy conditions, where most of the shower develops above the cloud. In the present work, we show how the EAS signal is modified in presence of uniform layer clouds. Also, a more realistic atmospheric model is being implemented to properly account the photon propagation of EAS to the telescope