2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14216A report on the characteristics of ultra-high energy air showers simulated with the AIRES program is presented. The AIRES system includes a fast simulating program which is an improved version of the well-known MOCCA program. The AIRES algorithms are briefly described and a series of results coming from the simulations are analyzed.To be presented at the 26th ICRC (Salt Lake City)AstrophysicsHigh Energy Physics - Phenomenologytext