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Geomagnetic activity in May 1977
Mean Ap11.4No. 631 of 1138
G1+ days6
G3+ days0
Max Ap662 May 1977
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 May 1977 | 6+ | 66 | G2 |
| 3 May 1977 | 5- | 15 | G1 |
| 4 May 1977 | 5+ | 19 | G1 |
| 11 May 1977 | 5+ | 24 | G1 |
| 12 May 1977 | 6- | 19 | G2 |
| 17 May 1977 | 5- | 18 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 1976 | 14.1 | 3 | 2 |
| May 1977 | 11.4 | 6 | 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 11.4 in May 1977, No. 631 of 1138 months since 1932; 6 days reached G1 or higher.