Aurora & Space WeatherHome › Geomagnetic history › 1940
Geomagnetic activity in June 1940
Mean Ap16.4No. 275 of 1138
G1+ days7
G3+ days1
Max Ap12625 Jun 1940
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 6 Jun 1940 | 5+ | 35 | G1 |
| 7 Jun 1940 | 5+ | 32 | G1 |
| 14 Jun 1940 | 6+ | 40 | G2 |
| 15 Jun 1940 | 5o | 26 | G1 |
| 18 Jun 1940 | 5o | 16 | G1 |
| 25 Jun 1940 | 8+ | 126 | G4 |
| 26 Jun 1940 | 6- | 24 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| June 1939 | 15.1 | 7 | 2 |
| June 1940 | 16.4 | 7 | 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 16.4 in June 1940, No. 275 of 1138 months since 1932; 7 days reached G1 or higher.