Fig. 8
Potential Field Source Surface (PFSS) extrapolations using magnetograms from GONG (left panel) and SDO/HMI (right panel). The line-of-sight averaged magnetic field along the line used in Fig. 3 yields ~3.5 G for the GONG and ~8 G for the SDO/HMI magnetograms, respectively. Note that the colour bar in each panel indicates the variation in magnetic field strength of the corresponding loop system.
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