COSMIC RAY TRANSPORT IN THE PRESENCE OF A CR-DRIVEN GALACTIC WIND

The transport of cosmic rays (CRs) in the Galaxy is known to be affected by the possible presence of winds launched from the Galactic disc. When these winds are pre-assigned, with a given velocity it can be checked that the effects on transport are limited to energies below ∼ 10 GeV. However, CRs escaping from the Galaxy can generate a galactic wind. The hydrodynamics of such wind has been studied in the past, showing that stationary outflow solutions to the wind equation exist for a wide range of the input parameters. Here we discuss a semi-analytical kinetic calculation for solving the CR transport problem coupled to the hydrodynamic problem of CR-driven galactic winds. In our nonlinear approach the CR diffusion coefficient is due only to scattering on self-generated waves. Our computation allows a self-consistent determination of the CR spectrum and diffusion coefficient, as well as the characteristics of the wind itself.