Fig. 3
Sunspot number data (magenta) for the two considered datasets and respective intrinsic mode functions ψ3 (blue) and ψ4 (green) obtained from their empirical mode decomposition. Panel a): wolf sunspot number (WSN). Panel b): group sunspot number (GSN). ψ3 and ψ4 are offset from the zero value by 250, 320 for WSN and 15, 30 for GSN.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.