Surface butterfly diagram of the four typical examples shown in Fig. 1, i.e., the azimuthal average of the magnetic field radial component as a function of time and colatitude at the surface. (a) Axial dipole with E = 10⁻⁴, Pr = 1, N_ρ = 3.5, Ra = 2.5 Ra_c, and Pm = 5. (b) Equatorial dipole with E = 3 × 10⁻⁵, Pr = 1, N_ρ = 3, Ra = 2.48 Ra_c, and Pm = 2. (c) Hemispherical dynamo with E = 3 × 10⁻⁴, Pr = 1, N_ρ = 6, Ra = 4 Ra_c, and Pm = 2. (d) Coherently oscillating dynamo with E = 3 × 10⁻⁴, Pr = 1, N_ρ = 6, Ra = 8 Ra_c, and Pm = 2.