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We discuss the effects of diffusion of high energy cosmic rays in turbulentextra-galactic magnetic fields. We find an approximate expression for the lowenergy suppression of the spectrum of the different mass components (withcharge $Z$) in the case in which this suppression happens at energies below$\sim Z$ EeV, so that energy losses are dominated by the adiabatic ones.  The low energy suppression appears when cosmic rays from the closest sourcestake a time comparable to the age of the Universe to reach the Earth. Thisoccurs for energies $E< Z\, {\rm EeV}\,(B/{{\rm G}})\sqrt{l_c/{\rmMpc}}(d_s/70\ {\rm Mpc})$ in terms of the magnetic field RMS strength $B$, itscoherence length $l_c$ and the typical separation between sources $d_s$.  We apply this to scenarios in which the sources produce a mixed compositionand have a relatively low maximum rigidity ($E_{max}\sim (2$--$10) Z $ EeV),finding that diffusion has a significant effect on the resulting spectrum, theaverage mass and on its spread, in particular reducing this last one. Forreasonable values of $B$ and $l_c$ these effects can help to reproduce thecomposition trends observed by the Auger Collaboration for source spectracompatible with Fermi acceleration.

Magnetic diffusion effects on the Ultra-High Energy Cosmic Ray spectrum and composition