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Geomagnetic activity in May 2021
Mean Ap6.5No. 1037 of 1138
G1+ days3
G3+ days1
Max Ap4212 May 2021
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 12 May 2021 | 7o | 42 | G3 |
| 20 May 2021 | 5+ | 24 | G1 |
| 26 May 2021 | 5- | 12 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 2020 | 3.7 | 0 | 0 |
| May 2021 | 6.5 | 3 | 1 |
Dates and time slots are UTC. Kp is the 3-hourly planetary geomagnetic index (0–9); Ap is the daily average disturbance. G1–G5 follow the NOAA storm scale (Kp 5- and above counted as G1). Aurora visibility also depends on weather and location. The latest values are preliminary.
About this page
Mean Ap 6.5 in May 2021, No. 1037 of 1138 months since 1932; 3 days reached G1 or higher.