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Geomagnetic activity in December 1981
Mean Ap10.1No. 744 of 1138
G1+ days3
G3+ days0
Max Ap3229 Dec 1981
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 12 Dec 1981 | 5- | 23 | G1 |
| 29 Dec 1981 | 6o | 32 | G2 |
| 30 Dec 1981 | 6- | 30 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1980 | 12.9 | 4 | 1 |
| December 1981 | 10.1 | 3 | 0 |
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 10.1 in December 1981, No. 744 of 1138 months since 1932; 3 days reached G1 or higher.