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Sunspot groups observed by Royal Greenwich Observatory/US Air Force/NOAA fromMay 1874 to November 2008 and the Carte Synoptique solar filaments from March1919 to December 1989 are used to investigate the relative phase shift of thepaired wings of butterfly diagrams of sunspot and filament activities.Latitudinal migration of sunspot groups (or filaments) does asynchronouslyoccur in the northern and southern hemispheres, and there is a relative phaseshift between the paired wings of their butterfly diagrams in a cycle, makingthe paired wings spatially asymmetrical on the solar equator. It is inferredthat hemispherical solar activity strength should evolve in a similar waywithin the paired wings of a butterfly diagram in a cycle, making the pairedwings just and only keep the phase relationship between the northern andsouthern hemispherical solar activity strengths, but a relative phase shiftbetween the paired wings of a butterfly diagram should bring about an almostsame relative phase shift of hemispheric solar activity strength.

The Phase Shifts of the Paired Wings of Butterfly Diagrams