Ultra High-Energy Cosmic Rays: the experimental challenge
The lectures focus on the astrophysics of cosmic rays at the highest
energies, above ~ 1 EeV.
An overview is given of the astrophysical issues to be addressed and of
the experimental techniques that can be used in this extreme energy range.
In the second part, the most recent results about the primary cosmic ray
origin, spectrum and composition are given, with particular focus on the
Pierre Auger Observatory. In addition, their implications from the point
of view of hadronic interactions are addressed.
The perspectives of future experimental efforts for this energy range
are shortly discussed.