Comparison of the helicity variation rate and the helicity flux computed in the practical DeVore gauge. The helicity variation rate (, dashed line) is derived from the volume-integration method. The total helicity flux through the whole surface, , of the domain is Ftot (red line). This flux is composed of Eqs. (26)−(29): FVn (green line), FBn (blue line), Fφ (orange line), and FAAp (purple line).
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