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Magnetic buoyancy is believed to drive the transport of magnetic flux tubesfrom the convection zone to the surface of the Sun. The magnetic fields formtwisted loop-like structures in the solar atmosphere. In this paper we usehelical forcing to produce a large-scale dynamo-generated magnetic field, whichrises even without magnetic buoyancy. A two layer system is used ascomputational domain where the upper part represents the solar atmosphere.Here, the evolution of the magnetic field is solved with the stress--and--relaxmethod. Below this region a magnetic field is produced by a helical forcingfunction in the momentum equation, which leads to dynamo action. We findtwisted magnetic fields emerging frequently to the outer layer, formingarch-like structures. In addition, recurrent plasmoid ejections can be found bylooking at space--time diagrams of the magnetic field. Recent simulations inspherical coordinates show similar results.

Dynamo generated field emergence through recurrent plasmoid ejections