Aurora & Space WeatherHome › Geomagnetic history › 1958
Geomagnetic activity in December 1958
Mean Ap15.3No. 345 of 1138
G1+ days7
G3+ days3
Max Ap544 Dec 1958
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Dec 1958 | 5+ | 23 | G1 |
| 4 Dec 1958 | 7- | 54 | G3 |
| 5 Dec 1958 | 7o | 28 | G3 |
| 13 Dec 1958 | 6o | 50 | G2 |
| 17 Dec 1958 | 6+ | 30 | G2 |
| 18 Dec 1958 | 7o | 33 | G3 |
| 19 Dec 1958 | 5- | 21 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1957 | 17.7 | 13 | 0 |
| December 1958 | 15.3 | 7 | 3 |
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 15.3 in December 1958, No. 345 of 1138 months since 1932; 7 days reached G1 or higher.