Aurora & Space WeatherHome › Geomagnetic history › 1957
Geomagnetic activity in December 1957
Mean Ap17.7No. 215 of 1138
G1+ days13
G3+ days0
Max Ap5331 Dec 1957
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Dec 1957 | 6- | 29 | G2 |
| 5 Dec 1957 | 5- | 26 | G1 |
| 6 Dec 1957 | 5- | 28 | G1 |
| 7 Dec 1957 | 5- | 21 | G1 |
| 11 Dec 1957 | 6- | 41 | G2 |
| 12 Dec 1957 | 5- | 29 | G1 |
| 13 Dec 1957 | 5o | 22 | G1 |
| 15 Dec 1957 | 5- | 22 | G1 |
| 17 Dec 1957 | 5- | 20 | G1 |
| 20 Dec 1957 | 5- | 20 | G1 |
| 21 Dec 1957 | 5- | 14 | G1 |
| 30 Dec 1957 | 5- | 18 | G1 |
| 31 Dec 1957 | 6- | 53 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1956 | 10.3 | 5 | 0 |
| December 1957 | 17.7 | 13 | 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 17.7 in December 1957, No. 215 of 1138 months since 1932; 13 days reached G1 or higher.