Periodic Variation of Solar Flare Index for the Last Solar Cycle (Cycle 24)

Table 1

Detected periods, their existence, and significance level in each data set used in this study.

Period (day)	Northern Hemisphere	Southern Hemisphere (%)	Whole disk (%)	Phase of the cycle
2048	plusmn; 512	+ >99	+ >99	+ >99% Max
1024	plusmn; 128	+ >99	—	+ >99% Max
682	plusmn; 57	+ >95	—	−first half
410	plusmn; 20	—	+ >99	+ >95% Max
293	plusmn; 11	—	+ >99	+ >99% Max
204	plusmn; 5	+ >95	—	−Max
149	plusmn; 2.7	—	—	+ >95% Max and descending
76.6	plusmn; 0.72	+ >95	—	−Max
52.2–62.5	plusmn; 0.44	+ >99	+ >99	+ >99% Max and descending
26.9–36.9	plusmn; 0.2	+ >95	+ >95	+ >95% Max and descending