Aims. In this paper we study the effects of a toroidalmagnetic flux tube emerging into a magnetized corona, with an emphasison large-scale eruptions. The orientation of the fields is such thatthe two flux systems are almost antiparallel when they meet. Methods. We follow the dynamic evolution of the system by solving the 3D MHD equations using a Lagrangian remap scheme. Results. Multiple eruptions are found to occur. The physics ofthe trigger mechanisms is discussed and related to well-known eruptionmodels. Key words: Sun: magnetic fields - Magnetohydrodynamics (MHD) - methods: numerical
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