Kp index — September 1937
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
6.7
30 Sep · G3
Storm nights
3
G2×2G3×1
Time at storm level
2.5%
intervals at Kp ≥ 5−
Avg Kp
1.8
all intervals
Tap a day — its eight intervals open here.
Highlights
- G3 storm · Sep 30 · peak Kp 6.7
1937 · the year at a glance — storm nights by month · year peak Kp 8.3
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.