Kp index — September 1946
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
9.0
22 Sep · G5
Storm nights
13
G1×4G2×2G3×4G4×2G5×1
Time at storm level
22.9%
intervals at Kp ≥ 5−
Avg Kp
3.3
all intervals
Tap a day — its eight intervals open here.
Highlights
- G5 storm · Sep 21–24 · peak Kp 9.0
1946 · 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.