2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50076In a gravitational field, we analyze the Maxwell equations, the correponding electromagnetic wave and continuity equations. A particular solution for parellel electric and magnetic fields in a gravitational background is presented. These solutions also satisfy the free-wave equations and the phenomenology suggested by plasma physics.10 pages, AMStexHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext