Cosmic Rays: Status of the Problem

by Dmitri Semikoz (APC, Paris)

Wednesday 15 Feb 2012, 14:00 → 15:00 Europe/Zurich

TH Theory Conference Room (CERN)

In this talk I'll review recent results on the Cosmic Rays (CR). At low energies two new breaks in the CR spectrum have been found recently at the energies around 10 GeV and 200 GeV. They indicate existence of new component of CR flux of an unknown origin or a change in the regime of propagation of CRs through the Galaxy at the break energies. I will discuss prospects for localization of low-energy CR sources and verification of the supernova hypothesis of the CR origin in the view of recent gamma-ray observations with Fermi and with ground-based gamma-ray telescopes. At energies around 10^18 eV anisotropy analysis of CRs helps to figure out transition energy from Galactic to extragalactic CRs. Finally, I'll discuss challenges in the search of the sources of extragalactic ultra-high energy cosmic rays.