Geomagnetic storms in 1939
In 1939, the maximum daily Kp reached storm level (Kp 5 or more) on 103 days. 26 days were strong (Kp 7 or more) and 1 extreme (Kp 9).
Max Kp9−
Storm days (Kp ≥ 5)103
Strong (Kp ≥ 7)26
Extreme (Kp 9)1
Storm days by month
Strongest storms
| Date | Max Kp | Daily Ap |
|---|---|---|
| April 17, 1939 | 8 | 135 |
| August 22, 1939 | 8− | 133 |
| July 5, 1939 | 7+ | 94 |
| April 23, 1939 | 8− | 92 |
| October 13, 1939 | 8 | 89 |
| August 23, 1939 | 8− | 89 |
| August 12, 1939 | 8− | 88 |
| April 24, 1939 | 9− | 79 |
| October 14, 1939 | 7− | 74 |
| February 25, 1939 | 7+ | 73 |
GFZ Potsdam, Kp index (CC BY 4.0), doi:10.5880/Kp.0001.