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Geomagnetic storm on 18 Sep 1971 (G3)
Max Kp7-G3
Ap47No. 5 in 1971
Consecutive G1+ days2
Ap rank1,081since 1932
Kp by 3-hour slot (UTC)
6o
7-
5+
6-
3o
4-
3o
2o
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 15 Sep 1971 | 3+ | 9 | – |
| 16 Sep 1971 | 4o | 11 | – |
| 17 Sep 1971 | 5o | 13 | G1 |
| 18 Sep 1971 | 7- | 47 | G3 |
| 19 Sep 1971 | 3o | 9 | – |
| 20 Sep 1971 | 4o | 16 | – |
| 21 Sep 1971 | 2+ | 5 | – |
Highest-Ap days of 1971
73
67
53
50
47
45
43
43
39
39
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 47: No. 1,081 of 34,615 days since 1932 by Ap.