Berlin 2014 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Astrophysik

EP 1.4: Vortrag

Montag, 17. März 2014, 15:00–15:15, DO24 1.103

Understanding the anisotropy of cosmic rays — •Robert Rettig — Universität Potsdam, Institut für Physik und Astronomie, Karl-Liebknecht-Strasse 24/25, 14476 Potsdam-Golm

The anisotropy in the distribution of cosmic-ray arrival directions measured in the TeV-energy range by several experiments shows both large and small-scale structures. While the large-scale anisotropy can be explained within the framework of a diffusive propagation of cosmic rays, the origin of the small-scale structures remains unclear. We investigate the arrival directions of charged particles using numerical three-dimensional Monte-Carlo test-particle simulations, in which the test-particles propagate in a time-independent spatially fluctuating magnetic field derived from a three-dimensional isotropic turbulence power spectrum. Is has been recently argued that the turbulent magnetic field itself generates the small-scale structures of the anisotropy if a global cosmic-ray dipole moment is present. Using our test-particle approach, we can test the reliability of that hypothesis.