Geomagnetic storms in 1940
In 1940, the maximum daily Kp reached storm level (Kp 5 or more) on 88 days. 23 days were strong (Kp 7 or more) and 3 extreme (Kp 9).
Max Kp9
Storm days (Kp ≥ 5)88
Strong (Kp ≥ 7)23
Extreme (Kp 9)3
Storm days by month
Strongest storms
| Date | Max Kp | Daily Ap |
|---|---|---|
| March 30, 1940 | 9− | 189 |
| March 24, 1940 | 9 | 187 |
| March 25, 1940 | 9− | 184 |
| March 31, 1940 | 8+ | 128 |
| June 25, 1940 | 8+ | 126 |
| March 29, 1940 | 8+ | 100 |
| April 3, 1940 | 8 | 98 |
| May 24, 1940 | 8− | 78 |
| April 25, 1940 | 8 | 70 |
| April 1, 1940 | 7− | 66 |
GFZ Potsdam, Kp index (CC BY 4.0), doi:10.5880/Kp.0001.