Aurora & Space WeatherHome › Geomagnetic history › 2017
Geomagnetic activity in December 2017
Mean Ap7.4No. 976 of 1138
G1+ days2
G3+ days0
Max Ap285 Dec 2017
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 5 Dec 2017 | 5o | 28 | G1 |
| 17 Dec 2017 | 5- | 23 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 2016 | 9.4 | 4 | 0 |
| December 2017 | 7.4 | 2 | 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 7.4 in December 2017, No. 976 of 1138 months since 1932; 2 days reached G1 or higher.