Cosmic Rays and Galactic Winds

Repeated SN-explosion provide large amounts of thermal energy as well as energetic particles through a 1. order Fermi-process. Both effects together with the generation of Alfven-waves are considered to drive a large scale outflow from a galaxy. These so-called galactic winds transport stellar material enriched by heavy elements into the intergalactic space explaining also the large amount of metals found in the intergalactic gas. The present contribution is focused on time-dependent effects which originate from galactic winds driven by a star burst activity. Shock waves travelling through the galactic wind and radiative cooling within the expanding plasma lead to complex flow structures. Depending e.g. on the SFR of the galaxy galactic winds can remove almost all ISM into the galactic halo and therefore cease a subsequent star formation.