Kp index — October 1991
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
8.3
28 Oct · G4
Storm nights
18
G1×8G2×5G3×3G4×2
Time at storm level
27.0%
intervals at Kp ≥ 5−
Avg Kp
3.6
all intervals
Tap a day — its eight intervals open here.
Highlights
- G4 storm · Oct 23–31 · peak Kp 8.3
1991 · 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.