On the Connection between Rieger-type and Magneto-Rossby Waves Driving the Frequency of the Large Solar Eruptions during Solar Cycles 19–25

Abstract Global solar activity variation mainly occurs over about an 11 yr cycle. However, both longer and shorter periodicities than the cycle are also present in many different indices. The timescales may be up to hundreds of years, while for global variability could within 0.5–2 yr, which include, e.g., from Rieger-type periods (150–160 days) quasi-biennial oscillations 2 yr. most likely origin this short-timescale quasi-periodicity is attributed magnetic Rossby waves, have 0.8–2.4 In work, we findings a unique evolution identified periodicities, like Rieger-type, arising throughout Solar Cycles 19–25. We report further observational evidence strong relationship between periodicity, magneto-Rossby major flare activity. Moreover, study reveals that field has continuous periodic longitudinal conveyor belt motion along equator, together with up-and-down movement latitudinal directions. found when these movements periodicity waves during same period cycle, present.