Aurora & Space WeatherHome › Geomagnetic history › 1977
Geomagnetic storm on 22 Sep 1977 (G3)
Max Kp7-G3
Ap63No. 4 in 1977
Consecutive G1+ days5
Ap rank529since 1932
Kp by 3-hour slot (UTC)
6+
6o
4+
4o
5-
6+
7-
4o
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 19 Sep 1977 | 6o | 42 | G2 |
| 20 Sep 1977 | 6- | 44 | G2 |
| 21 Sep 1977 | 7+ | 64 | G3 |
| 22 Sep 1977 | 7- | 63 | G3 |
| 23 Sep 1977 | 5o | 21 | G1 |
| 24 Sep 1977 | 4- | 12 | – |
| 25 Sep 1977 | 3o | 10 | – |
Highest-Ap days of 1977
69
66
64
63
62
61
49
48
48
47
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
Max Kp 7-, Ap 63: No. 529 of 34,615 days since 1932 by Ap.