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Geomagnetic activity in December 1977
Mean Ap10.5No. 712 of 1138
G1+ days6
G3+ days1
Max Ap692 Dec 1977
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Dec 1977 | 7o | 69 | G3 |
| 4 Dec 1977 | 5- | 14 | G1 |
| 5 Dec 1977 | 5- | 18 | G1 |
| 11 Dec 1977 | 5+ | 38 | G1 |
| 12 Dec 1977 | 6- | 21 | G2 |
| 17 Dec 1977 | 5o | 12 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1976 | 10.3 | 3 | 0 |
| December 1977 | 10.5 | 6 | 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 10.5 in December 1977, No. 712 of 1138 months since 1932; 6 days reached G1 or higher.