Aurora & Space WeatherHome › Geomagnetic history › 1939
Geomagnetic storm on 23 Apr 1939 (G4)
Max Kp8-G4
Ap92No. 4 in 1939
Consecutive G1+ days4
Ap rank202since 1932
Kp by 3-hour slot (UTC)
4-
7o
8-
6+
6+
7-
6o
4-
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 20 Apr 1939 | 5o | 27 | G1 |
| 21 Apr 1939 | 4+ | 24 | – |
| 22 Apr 1939 | 5- | 20 | G1 |
| 23 Apr 1939 | 8- | 92 | G4 |
| 24 Apr 1939 | 9- | 79 | G5 |
| 25 Apr 1939 | 7+ | 61 | G3 |
| 26 Apr 1939 | 4+ | 9 | – |
Highest-Ap days of 1939
135
133
94
92
89
89
88
79
74
73
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 8-, Ap 92: No. 202 of 34,615 days since 1932 by Ap.