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