Kp index — May 2021
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
7.0
12 May · G3
Storm nights
3
G1×2G3×1
Time at storm level
1.6%
intervals at Kp ≥ 5−
Avg Kp
1.2
all intervals
Tap a day — its eight intervals open here.
Highlights
- G3 storm · May 12 · peak Kp 7.0
- Strongest activity since August 2018
2021 · the year at a glance — storm nights by month · year peak Kp 7.7
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.