Kp index — January 1940
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
7.7
3 Jan · G4
Storm nights
11
G1×8G2×1G3×1G4×1
Time at storm level
8.1%
intervals at Kp ≥ 5−
Avg Kp
2.5
all intervals
Tap a day — its eight intervals open here.
Highlights
- G4 storm · Jan 3–5 · peak Kp 7.7
1940 · the year at a glance — storm nights by month · year peak Kp 9.0
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.