Kp index — May 1939
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
6.7
1 May · G3
Storm nights
16
G1×9G2×5G3×2
Time at storm level
17.3%
intervals at Kp ≥ 5−
Avg Kp
3.1
all intervals
Tap a day — its eight intervals open here.
Highlights
- G3 storm · May 1–3 · peak Kp 6.7
1939 · the year at a glance — storm nights by month · year peak Kp 8.7
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.