Aurora & Space WeatherHome › Geomagnetic history › 1938
Geomagnetic storm on 17 Jan 1938 (G4)
Max Kp8+G4
Ap120No. 3 in 1938
Consecutive G1+ days7
Ap rank100since 1932
Kp by 3-hour slot (UTC)
7-
6+
7-
6+
8+
8-
5-
6+
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 14 Jan 1938 | 3+ | 9 | – |
| 15 Jan 1938 | 3o | 9 | – |
| 16 Jan 1938 | 8- | 34 | G4 |
| 17 Jan 1938 | 8+ | 120 | G4 |
| 18 Jan 1938 | 5+ | 34 | G1 |
| 19 Jan 1938 | 5o | 24 | G1 |
| 20 Jan 1938 | 5- | 25 | G1 |
Highest-Ap days of 1938
136
128
120
107
103
100
76
67
67
62
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 120: No. 100 of 34,615 days since 1932 by Ap.