2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/854Point sources in the atmosphere are surrounded by aureole because of atmospheric scattering. The properties of the time-dependent aureole radiance are calculated by use of a Monte Carlo approach and an iterative method. Since the aureole is particularly important in the ultraviolet, which is the region the Ultra-High-Energy (UHE) cosmic ray experiment using the air fluorescence technique like Fly's Eye or High-Resolution-Fly's-Eye(HiRes) are set in. The effect of the multiply scatteing on the energy measurement is studied.17 pages, 17 figures, submitted t astr. part. physAstrophysicstext