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Geomagnetic activity in April 1937
Mean Ap20.0No. 158 of 1138
G1+ days8
G3+ days5
Max Ap12828 Apr 1937
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Apr 1937 | 5o | 22 | G1 |
| 3 Apr 1937 | 5o | 25 | G1 |
| 12 Apr 1937 | 5- | 19 | G1 |
| 24 Apr 1937 | 8o | 45 | G4 |
| 25 Apr 1937 | 7+ | 72 | G3 |
| 26 Apr 1937 | 8+ | 67 | G4 |
| 27 Apr 1937 | 7o | 61 | G3 |
| 28 Apr 1937 | 8o | 128 | G4 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1936 | 14.6 | 10 | 1 |
| April 1937 | 20.0 | 8 | 5 |
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 20.0 in April 1937, No. 158 of 1138 months since 1932; 8 days reached G1 or higher.