2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146818I give a concise introduction into high energy cosmic ray physics, including also few related aspects of high energy gamma-ray and neutrino astrophysics. The main emphasis is placed on astrophysical questions, and the level of the presentation is kept basic.82 pages, prepared for the 17th Jyvaskyla Summer School, comments welcomeAstrophysicstext