Comparison between the signed hemispheric yearly PFc_JJ and the WSO MF data (1996–2019). The sign used for the PFc_JJ has been taken the same as that from WSO for the respective year. There’s a good correspondence between the maximum number of PFc_JJ and the maximum WSO polar MF strength during the maximum years. A deficit in the number of PFc_JJ as compared to the WSO polar MF can be seen during the transit years between the periods of minimum and maximum MF strength. This seems to suggest that PFc_JJ are lacking the fainter variety of the PF, which are detected in the MWO and MDI imagery.