Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
For ultrahigh energy cosmic rays with energies above 10^18 eV there are still many open questions as "How can particles be accelerated to these energies?" and "What are their sources?". In addition the newest data from HiRes fluorescence detector, which seem consistent with a GZK cutoff,show a desagrement with the data from the AGASA ground array. In this talk I would like to show the results obtained by numerical simulations under different conditions of source distribution, strenght of extra-galactic magnetic field and nature of primary particles.