Aurora & Space WeatherGeomagnetic activity in 1938
Mean Ap15.2
G1+95days
G3+22days
G53days
G1+ days by month
- January 1938
- February 1938
- March 1938
- April 1938
- May 1938
- June 1938
- July 1938
- August 1938
- September 1938
- October 1938
- November 1938
- December 1938
Nearby years (G1+ days)
58
37
55
50
71
95
103
88
100
92
128
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 16 Apr 1938 | 9o | 136 | G5 |
| 22 Jan 1938 | 8+ | 128 | G4 |
| 17 Jan 1938 | 8+ | 120 | G4 |
| 25 Jan 1938 | 9- | 107 | G5 |
| 11 May 1938 | 9- | 103 | G5 |
| 15 Sep 1938 | 7+ | 100 | G3 |
| 12 May 1938 | 7+ | 76 | G3 |
| 15 Jul 1938 | 7o | 67 | G3 |
| 7 Oct 1938 | 7o | 67 | G3 |
| 26 Jan 1938 | 8+ | 62 | G4 |
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
1938 had 95 G1+ storm days (No. 31 of 95 years) and 22 G3+ days.