Comprehensive comparison of radio emission predicted by CoREAS and ZHAireS

C.S. CRUZ SANCHEZ; P. HANSEN; J. ALVAREZ-MUÑIZ; D. MELO; M. TUEROS

Nagoya

Conferencia; 38th International Cosmic Ray Conference; 2023

Institute for Cosmic Ray Research (ICRR), University of Tokyo, Japan - IUPAP

Radio detection of cosmic-ray induced extended air showers (EAS) has undergone an impressive development in the last two decades. Several ultra-high energy cosmic ray experiments are routinely detecting radio pulses in the MHz to GHz frequency range from EAS. These experimentaldevelopments require precise knowledge of the properties of the emitted radiation in order to interpret and analyze the collected data. We present a comparison of predicted radio pulses emitted by EAS simulated with CoREAS and ZHAireS, the two main and most widely used Monte Carlo simulation packages for this purpose. We have performed a set of  simulations of the radio emission in EAS induced by different primary particles, shower directions and magnetic field configurations. We have compared the frequency spectrum of the electric field amplitude onthe ground predicted by both packages at various observer positions with respect to the shower axis. We have used in both simulations input parameters as similar as possible, as well as a similar realistic atmospheric refractive index as a function of altitude. In addition, we havecompared showers with very similar values of depth of shower maximum. We have found a very good agreement, with typical relative differences of less than 10%, between the CoREAS and ZHAireS predictions for the dominant components of the electric field in the frequency rangefrom a few MHz to hundreds of MHz, where most experiments exploiting the radio technique for EAS detection operate.