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We report on three-dimensional (3D) Magnetohydrodynamic (MHD) simulations ofrecurrent eruptions in emerging flux regions. We find that reconnection ofsheared fieldlines, along the polarity inversion line of an emerging bipolarregion, leads to the formation of a new magnetic structure, which adopts theshape of a magnetic flux rope during its rising motion. Initially, the fluxrope undergoes a slow-rise phase and, eventually, it experiences a fast-risephase and ejective eruption towards the outer solar atmosphere. In total, foureruptions occur during the evolution of the system. For the first eruption, ouranalysis indicates that the torus instability initiates the eruption and thattether-cutting reconnection of the fieldlines, which envelope the flux rope,triggers the rapid acceleration of the eruptive field. For the followingeruptions, we conjecture that it is the interplay between tether-cuttingreconnection and torus instability, which causes the onset of the variousphases. We show the 3D shape of the erupting fields, focusing more on howmagnetic fieldlines reconnect during the eruptions. We find that when theenvelope fieldlines reconnect mainly with themselves, hot and dense plasma istransferred closer to the core of the erupting flux rope. The same area appearsto be cooler and less dense when the envelope fieldlines reconnect withneighboring sheared fieldlines. The plasma density and temperaturedistribution, together with the rising speeds, the energies and the size of theerupting fields indicate that they may account for small-scale (mini) CoronalMass Ejections (CMEs).

Recurrent CME-like eruptions in emerging flux regions. I. On the mechanism of eruptions