Across cycles
Solar Cycle 25 beside the last three maxima
Storm days per year — days the GFZ daily-maximum Kp reached G1 (Kp 5−, i.e. 4.67) — for the seven years around each cycle's smoothed sunspot maximum: two before, four after. The great storms often come on the declining side; 2003's storm was two years past cycle 23's peak.
Cycle 22maximum November 1989 · smoothed 212.5
698 storm days · strongest day Kp 9.0 · March 13, 1989
- 56
- 59
- 123▲ 1989
- 104
- 141
- 107
- 108
Cycle 23maximum November 2001 · smoothed 180.3
592 storm days · strongest day Kp 9.0 · July 15, 2000
- 77
- 83
- 63▲ 2001
- 74
- 158
- 60
- 77
Cycle 24maximum April 2014 · smoothed 116.4
310 storm days · strongest day Kp 8.3 · June 22, 2015
- 52
- 30
- 23▲ 2014
- 69
- 63
- 53
- 20
Cycle 25currentmaximum October 2024 · smoothed 160.9 · provisional
300 storm days · 5 of 7 years · strongest day Kp 9.0 · May 11, 2024
G1G2G3G4G5▲ maximum year* provisional (year not over)
This season · 1 September 2026 → October 13, 2026
5 storm days
strongest day Kp 7.3 · October 10, 2026 · updates with the archive refresh, every three days
Whole archive
Kp 9 ×27
intervals at Kp 9 since 1932 · the last May 11, 2024
Storm days: GFZ German Research Centre for Geosciences definitive Kp record (CC BY 4.0), each day classed by its maximum (G1 = Kp 5−, 4.67). Cycle maxima: the 13-month smoothed sunspot number in NOAA SWPC's observed solar-cycle series (SILSO), computed live for each cycle. Cycle 25's peak is provisional until SILSO fixes it.