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Geomagnetic activity in December 1947
Mean Ap10.6No. 693 of 1138
G1+ days3
G3+ days0
Max Ap306 Dec 1947
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Dec 1947 | 5- | 11 | G1 |
| 6 Dec 1947 | 5- | 30 | G1 |
| 9 Dec 1947 | 5- | 23 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1946 | 9.1 | 3 | 0 |
| December 1947 | 10.6 | 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 10.6 in December 1947, No. 693 of 1138 months since 1932; 3 days reached G1 or higher.