Resonance-centrifugal effects as a factor in the formation of solar magnetic arcades

The development of magnetohydrodynamical centrifugal instability is considered as a possible mechanism for the formation of solar magnetic arcades. The computations show that the plasma in a cylindrical, magnetized, rotating layer can develop two families of waveguide-resonance instability modes. These are gyroscopic resonance modes of the rotating, cylindrical layer and harmonics of fast magnetoacoustic waves that propagate along the forming cylindrical layer and initiate resonance instability in the layer. The joint action of these two mechanisms is able to produce the observed morphology of solar magnetic arcades.