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Geomagnetic storm on 31 May 1958 (G4)
Max Kp8oG4
Ap72No. 11 in 1958
Consecutive G1+ days3
Ap rank392since 1932
Kp by 3-hour slot (UTC)
2+
4o
2o
3+
4+
6+
8-
8o
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 28 May 1958 | 5- | 18 | G1 |
| 29 May 1958 | 6+ | 52 | G2 |
| 30 May 1958 | 3+ | 12 | – |
| 31 May 1958 | 8o | 72 | G4 |
| 1 Jun 1958 | 8- | 60 | G4 |
| 2 Jun 1958 | 5- | 26 | G1 |
| 3 Jun 1958 | 3- | 6 | – |
Highest-Ap days of 1958
200
199
131
103
89
85
82
82
77
75
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 8o, Ap 72: No. 392 of 34,615 days since 1932 by Ap.