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Geomagnetic activity in December 1989
Mean Ap16.3No. 280 of 1138
G1+ days10
G3+ days1
Max Ap5029 Dec 1989
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Dec 1989 | 6o | 38 | G2 |
| 2 Dec 1989 | 5- | 22 | G1 |
| 3 Dec 1989 | 5- | 26 | G1 |
| 4 Dec 1989 | 5+ | 31 | G1 |
| 5 Dec 1989 | 5+ | 14 | G1 |
| 22 Dec 1989 | 5+ | 26 | G1 |
| 26 Dec 1989 | 5o | 22 | G1 |
| 29 Dec 1989 | 7- | 50 | G3 |
| 30 Dec 1989 | 5o | 30 | G1 |
| 31 Dec 1989 | 6- | 35 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1988 | 13.5 | 6 | 0 |
| December 1989 | 16.3 | 10 | 1 |
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 16.3 in December 1989, No. 280 of 1138 months since 1932; 10 days reached G1 or higher.