Fig. 9.
Potential field extrapolation of the coronal magnetic field overlying the CBP at 17:21 UT. Top panel: background image is the HMI magnetogram from which the extrapolation has been made. The field lines are coloured according to the value of the vertical field component, with values in gauss as in the colour bar. Bottom panel: same but overlaid on a co-temporal AIA 193 image. The field line colours correspond to the logarithm of |B|.
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