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Explore the complex mechanisms governing how cosmic rays propagate through our galaxy in this 90-minute lecture from the CLAF/ICTP-SAIFR Latin-American Astroparticle Physics School. Delve into the fundamental physics behind cosmic ray transport, including diffusion processes, magnetic field interactions, and energy loss mechanisms that shape the journey of high-energy particles from their sources to Earth. Examine the role of galactic magnetic fields in deflecting and confining cosmic rays, understand how different particle species behave during propagation, and analyze the various physical processes that modify cosmic ray spectra as they traverse the interstellar medium. Learn about theoretical models and computational approaches used to simulate cosmic ray propagation, including diffusion-convection equations and numerical techniques for solving transport problems in complex galactic environments. Investigate observational evidence for propagation effects through analysis of cosmic ray composition, energy spectra, and anisotropy measurements, and discover how these observations constrain our understanding of galactic magnetic field structure and interstellar medium properties. Gain insights into current challenges in cosmic ray propagation theory, including the treatment of turbulent magnetic fields, the role of cosmic ray streaming instabilities, and the impact of galactic winds on particle transport, providing essential knowledge for understanding the cosmic ray puzzle and its implications for astroparticle physics research.
