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Geomagnetic activity in January 1939
Mean Ap7.1No. 996 of 1138
G1+ days0
G3+ days0
Max Ap1617 Jan 1939
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| – | – | – | – |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1938 | 28.5 | 18 | 5 |
| January 1939 | 7.1 | 0 | 0 |
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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About this page
Mean Ap 7.1 in January 1939, No. 996 of 1138 months since 1932; 0 days reached G1 or higher.