Study on the 3D anisotropic propagation of Galactic cosmic rays
July 22, 2019
Conventional cosmic-ray propagation models usually assume an isotropic diffusion coefficient to
account for the random deflection of cosmic rays by the turbulent interstellar magnetic field. Such
a picture is very successful in explaining a lot of observational phenomena related to the propagation
of galactic cosmic rays, such as broken power-law energy spectra, secondary-to-primary
ratios, etc. However, the isotropic diffusion presupposition is facing severe challenges from observations.
In particular, recent observations on the large-scale anisotropy of TeV cosmic rays
show that the dipole direction differs from the prediction of the conventional model. One possible
reason is that the large-scale regular magnetic field, which leads to an anisotropic diffusion
of cosmic rays, has not been included in the model provided by the public numerical packages.
In this work, we propose a pseudo source method to solve the 3-dimensional anisotropic transport
equation. Based on a realistic configuration of Galactic magnetic field, both proton energy
spectrum and B/C ratio are reproduced with proper transport parameters.
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