2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38057A study is presented of a possible future measurement of the longitudinal structure function $F_{L}(x,Q^{2})$ with different proton beam energies at HERA.5 pages Latex, including 1 ps-figure. To appear in: Proc. of the 1996 HERA Physics WorkshopHigh Energy Physics - Experimenttext