Monte Carlo Simulations For High Zenith Angle

With the advent of new generation Imaging Atmospheric Cherenkov Telescopes (IACTs), with improved sensitivity, it will be mandatory to extend observation to High Zenith Angles (HZA). This will allow us to extend by a large factor the observation time as well as the statistics for any gamma-ray source. Here we present some results obtained for several zenith angles and for different energies of the primary particle, obtained with a modification in the CORSIKA code, which will allow us to simulate and study the behavior of atmospheric Extensive Air Showers at HZA. In order to obtain more realistic results, the effect of the atmospheric attenuation, including Rayleigh scattering, Mie scattering and Ozone absorption, is included as well.