Kp index — April 1957
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
7.7
17 Apr · G4
Storm nights
14
G1×7G2×4G3×2G4×1
Time at storm level
16.3%
intervals at Kp ≥ 5−
Avg Kp
3.1
all intervals
Tap a day — its eight intervals open here.
Highlights
- G4 storm · Apr 17–19 · peak Kp 7.7
1957 · the year at a glance — storm nights by month · year peak Kp 9.0
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.