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LOCAL TURBULENCE AND THE DIPOLE ANISOTROPY OF GALACTIC COSMIC RAYS

The dipole anisotropy of multi-TeV cosmic rays exhibits a strong energy dependence that is at odds with the predictions of standard isotropic diﬀusion models. It has been argued that the observed variation in amplitude and phase is a consequence of the global distribution of cosmic ray sources in combination with anisotropic diﬀusion in our local environment. For a quantitative description of this eﬀect it is necessary to understand the complicated interplay of cosmic ray diﬀusion on local and global scales. In this work we study the impact of isotropic magnetic turbulence realisations on cosmic-ray propagation and anisotropy. We deﬁne a novel methodology that allows us to quantify generic properties of local and global diﬀusion with the help of test-particle simulations. We conﬁrm the emergence of local anisotropic diﬀusion that leads to an alignment of the cosmic ray dipole with the local magnetic ﬁeld and a reduction of its amplitude in perpendicular directions. We discuss the phenomenological consequences of these ﬁndings.