Kp index — December 1957
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
5.7
1 Dec · G2
Storm nights
13
G1×10G2×3
Time at storm level
11.3%
intervals at Kp ≥ 5−
Avg Kp
2.9
all intervals
Tap a day — its eight intervals open here.
Highlights
- G2 storm · Dec 1 · peak Kp 5.7
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.