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Geomagnetic activity in March 1940
Mean Ap36.5No. 6 of 1138
G1+ days13
G3+ days7
Max Ap18930 Mar 1940
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 9 Mar 1940 | 6+ | 27 | G2 |
| 12 Mar 1940 | 5o | 13 | G1 |
| 19 Mar 1940 | 5- | 20 | G1 |
| 20 Mar 1940 | 5- | 27 | G1 |
| 23 Mar 1940 | 7+ | 51 | G3 |
| 24 Mar 1940 | 9o | 187 | G5 |
| 25 Mar 1940 | 9- | 184 | G5 |
| 26 Mar 1940 | 7+ | 53 | G3 |
| 27 Mar 1940 | 5+ | 30 | G1 |
| 28 Mar 1940 | 5+ | 21 | G1 |
| 29 Mar 1940 | 8+ | 100 | G4 |
| 30 Mar 1940 | 9- | 189 | G5 |
| 31 Mar 1940 | 8+ | 128 | G4 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| March 1939 | 19.1 | 10 | 1 |
| March 1940 | 36.5 | 13 | 7 |
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 36.5 in March 1940, No. 6 of 1138 months since 1932; 13 days reached G1 or higher.