(a–b) Temporal evolution of residual Lorentz force and divergence of magnetic field, which are defined as ﹩R=\int | {\boldsymbol{J}}\times {\boldsymbol{B}}{| }^{2}{dV}﹩ and ﹩D=\int | {\boldsymbol{\nabla }}\cdot {\boldsymbol{B}}{| }^{2}﹩dV, respectively, where dV is a volume element. We considered the magnetic field as the NLFFF at 12,000 iterations denoted by the red circle. (c) EUV image obtained from AIA 131 Å observed at 08:36 UT on 2017 September 6. (d) NLFFF extrapolated from the photospheric magnetic field observed at 08:30 UT on 2017 September 6, superimposed on the image depicted in (c).