Temporal variability of the alternative Lorentz force density ﹩{s}_{z}^{\mathrm{ad}}﹩ and the individual terms (﹩{{\boldsymbol{B}}}_{h}^{2},{B}_{z}^{2}﹩) used to calculate it. For comparison, the diagram also shows f_z (﹩| {\boldsymbol{j}}\times {\boldsymbol{B}}{| }_{z}﹩). These quantities are provided for the same boxes 7 (panel (a)) and 9 (panel (b)) as presented in Figure 3.