Aurora & Space WeatherGeomagnetic activity in 1940
Mean Ap16.1
G1+88days
G3+23days
G53days
G1+ days by month
- January 1940
- February 1940
- March 1940
- April 1940
- May 1940
- June 1940
- July 1940
- August 1940
- September 1940
- October 1940
- November 1940
- December 1940
Nearby years (G1+ days)
55
50
71
95
103
88
100
92
128
64
59
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 30 Mar 1940 | 9- | 189 | G5 |
| 24 Mar 1940 | 9o | 187 | G5 |
| 25 Mar 1940 | 9- | 184 | G5 |
| 31 Mar 1940 | 8+ | 128 | G4 |
| 25 Jun 1940 | 8+ | 126 | G4 |
| 29 Mar 1940 | 8+ | 100 | G4 |
| 3 Apr 1940 | 8o | 98 | G4 |
| 24 May 1940 | 8- | 78 | G4 |
| 25 Apr 1940 | 8o | 70 | G4 |
| 1 Apr 1940 | 7- | 66 | G3 |
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
1940 had 88 G1+ storm days (No. 37 of 95 years) and 23 G3+ days.