Transition from Galactic to Extra-Galactic Cosmic Rays

Abstract

In this paper we review the main features of the observed Cosmic Rays spectrum in the energy range $10^{17}\mathrm{eV}÷10^{20}\mathrm{eV}$. We present a theoretical model that explains the main observed features of the spectrum, namely the second Knee and Dip, and implies a transition from Galactic to Extra-Galactic cosmic rays at energy $E\simeq 10^{18}$ eV, with a proton dominated Extra-Galactic spectrum.

3 pages, 2 eps figures, talk given at TAUP 2005, Zaragoza (Spain), 10-14 September 2005

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