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Geomagnetic activity in October 1977
Mean Ap13.0No. 505 of 1138
G1+ days9
G3+ days2
Max Ap6227 Oct 1977
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 11 Oct 1977 | 5- | 12 | G1 |
| 12 Oct 1977 | 5o | 28 | G1 |
| 14 Oct 1977 | 5- | 13 | G1 |
| 15 Oct 1977 | 5- | 19 | G1 |
| 18 Oct 1977 | 5o | 22 | G1 |
| 19 Oct 1977 | 6o | 28 | G2 |
| 22 Oct 1977 | 5o | 22 | G1 |
| 27 Oct 1977 | 7- | 62 | G3 |
| 28 Oct 1977 | 7+ | 47 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| October 1976 | 11.5 | 8 | 0 |
| October 1977 | 13.0 | 9 | 2 |
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.
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Mean Ap 13.0 in October 1977, No. 505 of 1138 months since 1932; 9 days reached G1 or higher.