7–11 Aug 2017
Columbus, Ohio, USA
US/Eastern timezone

On the Anisotropy of the Arrival Directions of Galactic Cosmic Rays

11 Aug 2017, 15:15
15m
Macedonian Room (The Athenaeum)

Macedonian Room

The Athenaeum

Oral Cosmic rays Cosmic rays

Speaker

Markus Ahlers (Niels Bohr International Academy, Niels Bohr Institute)

Description

The arrival directions of multi-TeV cosmic rays show significant anisotropies at large and small angular scales. I will argue that these features can be understood from standard cosmic ray diffusion. It is well-known that a large-scale dipole anisotropy is expected from a cosmic ray density gradient following the distribution of Galactic sources. However, the observed anisotropy depends on cosmic ray propagation in our local magnetic environment. The observed dipole amplitude and phase are a result of anisotropic diffusion along the local ordered magnetic field. The small-scale structures, on the other hand, are expected to arise from cosmic ray scattering in local magnetic turbulence.

Primary author

Markus Ahlers (Niels Bohr International Academy, Niels Bohr Institute)

Presentation materials