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Geomagnetic activity in October 1937
Mean Ap20.0No. 153 of 1138
G1+ days13
G3+ days3
Max Ap714 Oct 1937
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Oct 1937 | 5+ | 29 | G1 |
| 3 Oct 1937 | 5+ | 25 | G1 |
| 4 Oct 1937 | 8- | 71 | G4 |
| 8 Oct 1937 | 7- | 38 | G3 |
| 9 Oct 1937 | 6+ | 42 | G2 |
| 10 Oct 1937 | 6o | 38 | G2 |
| 11 Oct 1937 | 7o | 46 | G3 |
| 12 Oct 1937 | 5+ | 30 | G1 |
| 14 Oct 1937 | 5- | 13 | G1 |
| 15 Oct 1937 | 5o | 20 | G1 |
| 23 Oct 1937 | 6+ | 33 | G2 |
| 24 Oct 1937 | 6+ | 34 | G2 |
| 26 Oct 1937 | 5o | 29 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| October 1936 | 8.6 | 5 | 0 |
| October 1937 | 20.0 | 13 | 3 |
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.
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Mean Ap 20.0 in October 1937, No. 153 of 1138 months since 1932; 13 days reached G1 or higher.