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Geomagnetic activity in July 1977
Mean Ap13.6No. 455 of 1138
G1+ days6
G3+ days1
Max Ap6129 Jul 1977
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 6 Jul 1977 | 6- | 28 | G2 |
| 7 Jul 1977 | 5- | 15 | G1 |
| 14 Jul 1977 | 5- | 18 | G1 |
| 16 Jul 1977 | 5o | 27 | G1 |
| 20 Jul 1977 | 5o | 29 | G1 |
| 29 Jul 1977 | 7- | 61 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| July 1976 | 8.9 | 2 | 0 |
| July 1977 | 13.6 | 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 13.6 in July 1977, No. 455 of 1138 months since 1932; 6 days reached G1 or higher.