2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7234To demonstrate a degree of correlation between periodicity in the solar activity and a multi-resonant system three examples are considered. Although only two base frequencies were employed a relatively close correlation was obtained for periodicity, amplitude's envelope and some well-known longer-term anomalies, by using a simple mathematical formula.contains 3pages, 3 figures; .htm version additionAstrophysicstext