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Geomagnetic activity in October 1938
Mean Ap16.4No. 274 of 1138
G1+ days8
G3+ days3
Max Ap677 Oct 1938
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Oct 1938 | 7+ | 45 | G3 |
| 7 Oct 1938 | 7o | 67 | G3 |
| 8 Oct 1938 | 7o | 58 | G3 |
| 24 Oct 1938 | 5- | 23 | G1 |
| 25 Oct 1938 | 5+ | 34 | G1 |
| 26 Oct 1938 | 5o | 33 | G1 |
| 27 Oct 1938 | 5o | 33 | G1 |
| 28 Oct 1938 | 5- | 22 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| October 1937 | 20.0 | 13 | 3 |
| October 1938 | 16.4 | 8 | 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 16.4 in October 1938, No. 274 of 1138 months since 1932; 8 days reached G1 or higher.