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Geomagnetic activity in December 1941
Mean Ap11.3No. 639 of 1138
G1+ days3
G3+ days1
Max Ap831 Dec 1941
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Dec 1941 | 8- | 83 | G4 |
| 2 Dec 1941 | 6o | 28 | G2 |
| 16 Dec 1941 | 5o | 13 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1940 | 14.6 | 8 | 0 |
| December 1941 | 11.3 | 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 11.3 in December 1941, No. 639 of 1138 months since 1932; 3 days reached G1 or higher.