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Geomagnetic activity in May 1981
Mean Ap19.6No. 164 of 1138
G1+ days9
G3+ days4
Max Ap6111 May 1981
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 9 May 1981 | 6+ | 39 | G2 |
| 10 May 1981 | 7o | 32 | G3 |
| 11 May 1981 | 7- | 61 | G3 |
| 15 May 1981 | 7o | 54 | G3 |
| 16 May 1981 | 6+ | 59 | G2 |
| 17 May 1981 | 5+ | 13 | G1 |
| 18 May 1981 | 7o | 57 | G3 |
| 20 May 1981 | 6+ | 43 | G2 |
| 25 May 1981 | 5+ | 33 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 1980 | 10.3 | 6 | 0 |
| May 1981 | 19.6 | 9 | 4 |
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 19.6 in May 1981, No. 164 of 1138 months since 1932; 9 days reached G1 or higher.