Evolution of hydrogen ionization fronts expanding into the IGM in a simulation representing the first stage of the reionization history around z = 15. The volume is (5.3 Mpc)3 in comoving coordinates, resolved in 1013 grid cells containing ten randomly distributed clusters of massive population III stars. Each cluster emits 4 × 1053 hydrogen-ionizing photons per second, corresponding to a star formation rate of 9.5 × 10-3 M⊙ yr-1 per comoving Mpc3. The evolution of the ionization fronts starts with a set of discrete H ii regions which begin to overlap after approximately 1 Myr. Hydrogen is completely ionized after 50 Myr (corresponding to Δz ~ 1.5 at z = 15).
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