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Geomagnetic activity in February 1939
Mean Ap15.2No. 346 of 1138
G1+ days6
G3+ days2
Max Ap7325 Feb 1939
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Feb 1939 | 5- | 20 | G1 |
| 6 Feb 1939 | 5+ | 43 | G1 |
| 7 Feb 1939 | 5- | 22 | G1 |
| 11 Feb 1939 | 5- | 14 | G1 |
| 24 Feb 1939 | 7+ | 55 | G3 |
| 25 Feb 1939 | 7+ | 73 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| February 1938 | 15.9 | 7 | 1 |
| February 1939 | 15.2 | 6 | 2 |
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 15.2 in February 1939, No. 346 of 1138 months since 1932; 6 days reached G1 or higher.