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Geomagnetic activity in December 1984
Mean Ap17.8No. 211 of 1138
G1+ days13
G3+ days0
Max Ap3316 Dec 1984
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Dec 1984 | 5o | 27 | G1 |
| 4 Dec 1984 | 5o | 28 | G1 |
| 11 Dec 1984 | 5+ | 19 | G1 |
| 12 Dec 1984 | 5o | 17 | G1 |
| 13 Dec 1984 | 6o | 27 | G2 |
| 15 Dec 1984 | 6- | 24 | G2 |
| 16 Dec 1984 | 5+ | 33 | G1 |
| 17 Dec 1984 | 5- | 28 | G1 |
| 26 Dec 1984 | 5- | 26 | G1 |
| 27 Dec 1984 | 5- | 17 | G1 |
| 28 Dec 1984 | 5+ | 31 | G1 |
| 29 Dec 1984 | 5- | 26 | G1 |
| 31 Dec 1984 | 5- | 24 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1983 | 14.7 | 7 | 0 |
| December 1984 | 17.8 | 13 | 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 17.8 in December 1984, No. 211 of 1138 months since 1932; 13 days reached G1 or higher.