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We here report calculations of magnetic buoyancy instabilities of a shearedmagnetic layer where two separate zones are unstable. The idea is to study thepossible generation of large-scale helical structures which could then risethrough a stellar convection zone and emerge at the surface to create activeregions. The calculations shown here are a follow-up of the work of Favier etal. (2012) where the instability developed in a weakly magnetized atmosphere,consisting of a uniform field oriented in a different direction from theunstable layer below. Here, the top layer representing the atmosphere is itselfunstable to buoyancy instabilities and thus quickly creates a more complexmagnetic configuration with which the layer below will interact. We also findin this case that the accumulation of magnetic tension between the two unstablelayers favors the creation of large-scale helical structures.

Twisted magnetic structures emerging from buoyancy instabilities