2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/906We analyse the radiation pressure instability of the standard, optically thisc disc and propose it as an explanation of the obseved variability of the superluminal microquasar GRS 1915+105. The quantitave agreement with the observed outburst amplitudes is obtained under the assumption that substantial part of the energy is carried away by the jet.5 pages, 2 postscript figures; contribution to the conference "DISCS 2000", Kopenhagen, January 5-8 2000Astrophysicstext