Snapshots of mantle viscosity for 55 Cancri e models with T_day = 2800 K and T_night = 1150 K. The magma ocean is indicated in red (fully molten) and orange (partially molten). H₀, H_E, and H_h indicate no internal heating, Earth-like internal heating, and high internal heating, respectively. The left column shows the models with a constant CMB temperature. The right column shows the models where the CMB temperature decreases due to core cooling. Small downwellings can form in the bridgmanite layer for no internal heating, but they do not penetrate into the post-perovskite layer (indicated by the white dashed line). For higher internal heating, these downwellings become more diffuse.