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Geomagnetic activity in January 1938
Mean Ap28.5No. 29 of 1138
G1+ days18
G3+ days5
Max Ap12822 Jan 1938
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Jan 1938 | 5+ | 27 | G1 |
| 6 Jan 1938 | 5- | 11 | G1 |
| 7 Jan 1938 | 5- | 21 | G1 |
| 8 Jan 1938 | 5+ | 20 | G1 |
| 9 Jan 1938 | 5- | 11 | G1 |
| 12 Jan 1938 | 5o | 15 | G1 |
| 13 Jan 1938 | 6- | 29 | G2 |
| 16 Jan 1938 | 8- | 34 | G4 |
| 17 Jan 1938 | 8+ | 120 | G4 |
| 18 Jan 1938 | 5+ | 34 | G1 |
| 19 Jan 1938 | 5o | 24 | G1 |
| 20 Jan 1938 | 5- | 25 | G1 |
| 21 Jan 1938 | 6- | 38 | G2 |
| 22 Jan 1938 | 8+ | 128 | G4 |
| 25 Jan 1938 | 9- | 107 | G5 |
| 26 Jan 1938 | 8+ | 62 | G4 |
| 29 Jan 1938 | 5- | 15 | G1 |
| 31 Jan 1938 | 6o | 34 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1937 | 7.2 | 1 | 0 |
| January 1938 | 28.5 | 18 | 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.
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Mean Ap 28.5 in January 1938, No. 29 of 1138 months since 1932; 18 days reached G1 or higher.