Figures depicting the evolution of the B4 field embedded in a dipolar background field. The three times used are t = 0,2.25,4.5 shown from left to right respectively. Panels a)−c): core embedded in the background field. Panels d)−f): core from above. Panels g)−i): current contours of the field. Panels j)−l): emission proxy E(x,y). Panels m)−o): local twisting distribution Lf(x,y).
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