Aurora & Space WeatherHome › Geomagnetic history › 1973
Geomagnetic activity in December 1973
Mean Ap11.4No. 637 of 1138
G1+ days5
G3+ days0
Max Ap3421 Dec 1973
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Dec 1973 | 6o | 29 | G2 |
| 5 Dec 1973 | 5o | 17 | G1 |
| 20 Dec 1973 | 5+ | 29 | G1 |
| 21 Dec 1973 | 5o | 34 | G1 |
| 22 Dec 1973 | 5o | 25 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1972 | 10.1 | 5 | 1 |
| December 1973 | 11.4 | 5 | 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 11.4 in December 1973, No. 637 of 1138 months since 1932; 5 days reached G1 or higher.