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Norway-CERN

TeV-PeV Cosmic Rays Propagating in our Galaxy: The Diffusion Approximation and Beyond

by Gwenael Giacinti (NTNU Trondheim, Norway)

Wednesday, 25 April 2012 from to (Europe/Zurich)
at bergen ( 366 )
allegaten 55, 5007 Bergen
Description evo connection URL:

http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MvM2Ml2v2tD9Di9D9eDe9v


Abstract:


"The Cosmic Ray (CR) flux at Earth mostly consists of energetic protons and nuclei. CRs with TeV-PeV energies are thought to be accelerated in Galactic supernovae remnants, although an unambiguous proof is still missing. On their way to the observer, CRs scatter on inhomogeneities of the Galactic magnetic field. Consequently, the propagation of CRs in the Milky Way resembles a random walk, and can be described as a diffusive process through the "diffusion approximation". After reviewing the current knowledge in the field, we will discuss two important and topical cases in which the diffusion approximation starts to fail. First, we will propose an explanation for the enigmatic anisotropies that are observed at small angular scales on the sky in the CR arrival directions at Earth. Second, we will show that CR densities around their sources should be expected to be -moderately to strongly- anisotropic, which in turn has important implications for gamma ray astronomy."
Organised by Anna Lipniacka, Heidi Sandaker