hide
Free keywords:
Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
MPINP:
Theoretische Astrophysik - Abteilung Hinton
Abstract:
We calculate the shape of the large-scale anisotropy of TeV-PeV cosmic-rays
(CR) in different models of the interstellar turbulence. In general, the
large-scale CR anisotropy (CRA) is not a dipole, and its shape can be used as a
new probe of the turbulence. The 400 TeV and 2 PeV data sets of IceTop can be
fitted with Goldreich-Sridhar turbulence and a broad resonance function, but
other possibilities are not excluded. We then present our first numerical
calculations of the CRA down to 3 TeV energies in 3D isotropic Kolmogorov
turbulence. At these low energies, the large-scale CRA aligns well with the
direction of local magnetic field lines around the observer. In this type of
turbulence, the CR intensity is flat in a broad region perpendicular to field
lines. Even though the CRA is quite gyrotropic, we show that the local
configuration of the turbulence around the observer does result in the
appearance of weak, "non-gyrotropic" small-scale anisotropies, which contain
information on the local turbulence level.
