Kp index — April 1978
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
8.0
30 Apr · G4
Storm nights
16
G1×5G2×6G3×3G4×2
Time at storm level
18.8%
intervals at Kp ≥ 5−
Avg Kp
3.1
all intervals
Tap a day — its eight intervals open here.
Highlights
- G4 storm · Apr 30 · peak Kp 8.0
1978 · 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.