Magnitude of the horizontal magnetic field changes at three different times during the eruption. The change in absolute value of the horizontal magnetic field ﹩\delta {B}_{h}(z=0.1)﹩ is defined by the color code. The arrows are the same as in Figure 3. The solid contour lines mark the electric current density at levels ﹩{j}_{z}(z=0.1)=-2.2,﹩ −0.4, 1.6, and 2.7 (see j_z maps in Figure 3). The animation begins at ﹩t=164{t}_{A}﹩ and ends at ﹩t=244{t}_{A}﹩.

(An animation of this figure is available.)

The video/animation of this figure is available in the online journal.