Fig. 8
Time series (2010.4–2011.6) of the noise-affected average unsigned vertical flux density (dashed curve) and its counterpart after noise removal (solid curve), representing the disk center region (r/r⊙ < 0.1). The solid curve never dips below the 3.0 G level, which can be interpreted as the basal flux density at the HMI resolution of 1 arcsec.
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