Kp index — 1981
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
8.3
13 Apr · G4
Storm nights
14
G1×7G2×4G3×2G4×1
Time at storm level
24.6%
intervals at Kp ≥ 5−
Avg Kp
3.3
all intervals
Tap a day — its eight intervals open here.
Highlights
- G4 storm · Apr 11–14 · peak Kp 8.3
- Strongest activity since August 1978
1981 · 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.