Fig. 12
a) Potential field extrapolation of the AR using HMI magnetogram at 16:48:38 UT. The closed and open field lines are shown in blue and white, respectively. b) Variation of the decay index with respect to height (Mm) above the PIL. The red horizontal dashed line indicates the threshold value of the decay index (1.5) at a height of ~120 Mm (blue vertical dashed line).
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