Kp index — September 2017
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
8.3
8 Sep · G4
Storm nights
11
G1×6G2×2G3×1G4×2
Time at storm level
11.3%
intervals at Kp ≥ 5−
Avg Kp
2.6
all intervals
Tap a day — its eight intervals open here.
Highlights
- G4 storm · Sep 7–8 · peak Kp 8.3
- Strongest activity since June 2015
- 11 storm nights — most in a month since 2005
2017 · 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.