Small-Scale Anisotropies of Cosmic Rays from Turbulent Flow (2402.16554v1)
Abstract: Within the classical convection--diffusion approximation, we show that the angular distribution of cosmic rays (CRs) in a highly turbulent flow may exhibit significant small-scale anisotropies. The CR intensity angular power spectrum $ C_\ell $ is then a direct reflection of interstellar turbulence, from which one expects $ C_\ell\propto\ell{-\gamma -1} $ for $ \ell\gg 1 $, where $ \gamma $ is the power-law turbulence spectral index. Observations by IceCube and HAWC at TeV energies can be explained approximately with the Kolmogorov law $ \gamma =5/3 $ with a convection velocity dispersion of 20 km/s on the scale of 10 pc.
Collections
Sign up for free to add this paper to one or more collections.
Paper Prompts
Sign up for free to create and run prompts on this paper using GPT-5.
