What are the high energy cosmic rays telling us?

Abstract

We review in these notes the recent results of the Pierre Auger Observatory related to ultra high energy cosmic rays. We describe the components of the observatory and the status of its operation. The observations related here cover the correlation with astrophysical sources and its implications, as well as the determination of the spectrum at the higher end of energy, and the detemination of the primary cosmic rays being photons. We also report on the limit of the neutrino flux. It is described the next steps in the layout of the Observatory, which includes extending the capabilities of the Southern observatory to lower energies and, in the Northen Hemisphere the construction of a new observatory in Colorado, USA.