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Geomagnetic activity in December 2021
Mean Ap6.5No. 1038 of 1138
G1+ days1
G3+ days0
Max Ap181 Dec 2021
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 19 Dec 2021 | 5o | 14 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 2020 | 4.8 | 0 | 0 |
| December 2021 | 6.5 | 1 | 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 6.5 in December 2021, No. 1038 of 1138 months since 1932; 1 days reached G1 or higher.