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Geomagnetic activity in January 1947
Mean Ap12.5No. 547 of 1138
G1+ days6
G3+ days0
Max Ap6125 Jan 1947
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Jan 1947 | 5- | 21 | G1 |
| 5 Jan 1947 | 5- | 24 | G1 |
| 16 Jan 1947 | 6+ | 36 | G2 |
| 24 Jan 1947 | 6- | 22 | G2 |
| 25 Jan 1947 | 6+ | 61 | G2 |
| 26 Jan 1947 | 5+ | 28 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1946 | 12.6 | 5 | 1 |
| January 1947 | 12.5 | 6 | 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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Mean Ap 12.5 in January 1947, No. 547 of 1138 months since 1932; 6 days reached G1 or higher.