Kp index — May 1999
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
5.0
13 May · G1
Storm nights
2
G1×2
Time at storm level
1.6%
intervals at Kp ≥ 5−
Avg Kp
1.7
all intervals
Tap a day — its eight intervals open here.
Highlights
- G1 storm · May 13 · peak Kp 5.0
1999 · the year at a glance — storm nights by month · year peak Kp 8.0
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.