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Geomagnetic activity in December 1937
Mean Ap9.7No. 787 of 1138
G1+ days4
G3+ days0
Max Ap3623 Dec 1937
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Dec 1937 | 5o | 20 | G1 |
| 18 Dec 1937 | 5- | 20 | G1 |
| 23 Dec 1937 | 6+ | 36 | G2 |
| 24 Dec 1937 | 5- | 13 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1936 | 5.5 | 1 | 0 |
| December 1937 | 9.7 | 4 | 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.
About this page
Mean Ap 9.7 in December 1937, No. 787 of 1138 months since 1932; 4 days reached G1 or higher.