Aurora & Space WeatherHome › Geomagnetic history › 2011
Geomagnetic activity in December 2011
Mean Ap4.0No. 1128 of 1138
G1+ days0
G3+ days0
Max Ap103 Dec 2011
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| – | – | – | – |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 2010 | 4.2 | 0 | 0 |
| December 2011 | 4.0 | 0 | 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 4.0 in December 2011, No. 1128 of 1138 months since 1932; 0 days reached G1 or higher.