Abstract
New estimates of energy of giant air showers observed at the Yakutsk array have been simulated both by the CORSIKA code with the thinning level of 10 −6 and by our modified multilevel scheme in terms of the quark-gluon string model. Both approaches use the GEANT4 code to simulate the responses of scintillation detector stations in giant air showers. These new estimates show approximately 1.7 lower energies of giant air showers for a given signal s (600) in comparison with the standard approach used at the Yakutsk array. If these new estimates of energy are accepted then the intensity of giant air showers observed at the Yakutsk array would be approximately the same as observed by the HiRes Collaboration. Simulations of the Cherenkov radiation are in agreement with data observed at the Yakutsk array if the value of the signal s (600) is ignored. But for fixed value of signal s (600) simulations show lower number of Cherenkov photons.
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