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Geomagnetic activity in August 1938
Mean Ap12.4No. 556 of 1138
G1+ days8
G3+ days2
Max Ap504 Aug 1938
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Aug 1938 | 5- | 19 | G1 |
| 2 Aug 1938 | 6o | 27 | G2 |
| 3 Aug 1938 | 7+ | 27 | G3 |
| 4 Aug 1938 | 7- | 50 | G3 |
| 5 Aug 1938 | 5o | 29 | G1 |
| 11 Aug 1938 | 6o | 39 | G2 |
| 22 Aug 1938 | 5o | 18 | G1 |
| 23 Aug 1938 | 6o | 28 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| August 1937 | 10.2 | 4 | 1 |
| August 1938 | 12.4 | 8 | 2 |
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 12.4 in August 1938, No. 556 of 1138 months since 1932; 8 days reached G1 or higher.