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Fig. 8


Simulation with αBL = 27 + 100% fluctuations and αMF = 0.4 + 200% fluctuations. The top panel depicts the toroidal field amplitude in the north and south hemispheres; the middle panel is a butterfly diagram for the toroidal field at the base of the convection zone; and the bottom panel shows the radial field near the surface (lighter and darker shades denotes positive and negative radial fields, respectively). This solution, representative of simulations with intermittency in both mean-field and Babcock-Leighton poloidal sources, displays self-consistent entry and exit from grand minima episodes. The butterfly diagram is characterized by hemispheric asymmetry in activity, parity shifts, and occasional sunspot eruptions during the minimum phase. The radial field evolution shows regular polarity reversals in the weak dipolar component of the magnetic field throughout the minimum in activity.

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