Aurora & Space WeatherHome › Geomagnetic history › 1939
Geomagnetic activity in March 1939
Mean Ap19.1No. 175 of 1138
G1+ days10
G3+ days1
Max Ap7129 Mar 1939
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Mar 1939 | 5o | 22 | G1 |
| 2 Mar 1939 | 6- | 26 | G2 |
| 3 Mar 1939 | 5- | 20 | G1 |
| 4 Mar 1939 | 5o | 28 | G1 |
| 9 Mar 1939 | 5o | 19 | G1 |
| 21 Mar 1939 | 5o | 22 | G1 |
| 27 Mar 1939 | 5+ | 26 | G1 |
| 28 Mar 1939 | 7- | 56 | G3 |
| 29 Mar 1939 | 6+ | 71 | G2 |
| 30 Mar 1939 | 5+ | 32 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| March 1938 | 13.2 | 7 | 0 |
| March 1939 | 19.1 | 10 | 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 19.1 in March 1939, No. 175 of 1138 months since 1932; 10 days reached G1 or higher.