Kp index — September 1955
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
6.7
30 Sep · G3
Storm nights
5
G1×4G3×1
Time at storm level
3.8%
intervals at Kp ≥ 5−
Avg Kp
2.3
all intervals
Tap a day — its eight intervals open here.
Highlights
- G3 storm · Sep 29–30 · peak Kp 6.7
1955 · the year at a glance — storm nights by month · year peak Kp 7.7
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.