Scaled superposed epoch analysis (top panel) and histogram of the reduction or enhancement during each event (bottom panel) of Wind’s floating potential during all SIRs that are associated with CIRs since 2005, in analogy to Fig. 12. The shaded red confidence band in the top panel corresponds to the standard deviation and a 1 V measurement uncertainty for individual measurements of the floating potential. The first fourteen SIRs of 2005 were not taken into account because no spacecraft floating potential data was available.