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Geomagnetic activity in December 1978
Mean Ap13.2No. 485 of 1138
G1+ days9
G3+ days0
Max Ap4818 Dec 1978
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 14 Dec 1978 | 6- | 28 | G2 |
| 15 Dec 1978 | 6+ | 28 | G2 |
| 18 Dec 1978 | 6- | 48 | G2 |
| 19 Dec 1978 | 5- | 24 | G1 |
| 25 Dec 1978 | 6- | 21 | G2 |
| 28 Dec 1978 | 5- | 14 | G1 |
| 29 Dec 1978 | 5o | 20 | G1 |
| 30 Dec 1978 | 5o | 27 | G1 |
| 31 Dec 1978 | 5- | 18 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1977 | 10.5 | 6 | 1 |
| December 1978 | 13.2 | 9 | 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 13.2 in December 1978, No. 485 of 1138 months since 1932; 9 days reached G1 or higher.