Kp index — August 2026
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-08-01
provisionalthis month's page ↗
Max Kp
1.0
1 Aug
Storm nights
0
none
Time at storm level
0.0%
intervals at Kp ≥ 5−
Avg Kp
0.6
all intervals
Tap a day — its eight intervals open here.
2026 · the year at a glance — storm nights by month · year peak Kp 8.7
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.
The hall of storms — the ten greatest since 1932
- 01Kp 9.029–30 Oct 2003 · peak 06:00 UTC · 9.0 ×3Europe & North America — aurora to the Mediterranean and Florida; Malmö lost power
- 02Kp 9.010–11 May 2024 · peak 00:00 UTC · 9.0 ×2worldwide — aurora photographed on every continent, the strongest storm in two decades
- 03Kp 9.0peak 06:00 UTC · 9.0 ×2
- 04Kp 9.013–14 Mar 1989 · peak 21:00 UTC · 9.0 ×2North America — Hydro-Québec's grid collapsed in 90 seconds, six million in the dark; aurora to Florida and Cuba
- 05Kp 9.024–25 Mar 1940 · peak 15:00 UTC · 9.0 ×2North America — telegraph and power disturbances across the US
- 06Kp 9.025–26 May 1967 · peak 21:00 UTC · 9.0 ×2North America — jammed US early-warning radars, briefly read as an attack
- 07Kp 9.0peak 21:00 UTC · 9.0 ×2Europe — Swedish railway signalling disrupted
- 08Kp 9.0peak 03:00 UTCNorth America & Europe — aurora over wartime blackouts
- 09Kp 9.0peak 15:00 UTC
- 10Kp 9.0peak 06:00 UTC
Ranked from the data: peak Kp, then intervals spent at 9.0. Nicknames and reach notes only where documented.