Hall of storms · #1 / 10
The Halloween storms
Peak Kp
Kp 9.0
G5 — top storm class
Peak moment
06:00 UTC
October 29, 2003
Duration
2 days
October 29–30, 2003
At the ceiling
9.0 ×3
3 intervals at Kp 9.0
The storm, three hours at a time
How long did it hold, and when did it peak?
33 hours at G4 or above · 69 at G1 or above
| Time (UTC) | Kp | Source |
|---|---|---|
| Oct 28 · 00:00 UTC | 3.0 | measured |
| Oct 28 · 03:00 UTC | 4.7 | measured |
| Oct 28 · 06:00 UTC | 3.7 | measured |
| Oct 28 · 09:00 UTC | 4.7 | measured |
| Oct 28 · 12:00 UTC | 2.7 | measured |
| Oct 28 · 15:00 UTC | 4.0 | measured |
| Oct 28 · 18:00 UTC | 3.3 | measured |
| Oct 28 · 21:00 UTC | 4.0 | measured |
| Oct 29 · 00:00 UTC | 4.7 | measured |
| Oct 29 · 03:00 UTC | 4.0 | measured |
| Oct 29 · 06:00 UTC | 9.0 | measured |
| Oct 29 · 09:00 UTC | 8.0 | measured |
| Oct 29 · 12:00 UTC | 7.7 | measured |
| Oct 29 · 15:00 UTC | 7.7 | measured |
| Oct 29 · 18:00 UTC | 8.7 | measured |
| Oct 29 · 21:00 UTC | 8.7 | measured |
| Oct 30 · 00:00 UTC | 8.7 | measured |
| Oct 30 · 03:00 UTC | 7.3 | measured |
| Oct 30 · 06:00 UTC | 5.3 | measured |
| Oct 30 · 09:00 UTC | 4.7 | measured |
| Oct 30 · 12:00 UTC | 5.0 | measured |
| Oct 30 · 15:00 UTC | 7.0 | measured |
| Oct 30 · 18:00 UTC | 9.0 | measured |
| Oct 30 · 21:00 UTC | 9.0 | measured |
| Oct 31 · 00:00 UTC | 8.3 | measured |
| Oct 31 · 03:00 UTC | 7.7 | measured |
| Oct 31 · 06:00 UTC | 7.3 | measured |
| Oct 31 · 09:00 UTC | 6.7 | measured |
| Oct 31 · 12:00 UTC | 7.3 | measured |
| Oct 31 · 15:00 UTC | 4.7 | measured |
| Oct 31 · 18:00 UTC | 4.0 | measured |
| Oct 31 · 21:00 UTC | 4.3 | measured |
under 3 · quiet3 to G1 · activeG1–G4 · stormG5 · extreme
Each bar is a three-hour UTC slot · lines at each 00 UTC · shaded days are the storm itself · GFZ definitive Kp.
What it reached
Europe & North America — aurora to the Mediterranean and Florida; Malmö lost power
Open in the archive
October 2003 — the three-hourly Kp values, day by day
From the ground
The Night It Broke — one substorm at Skaftafell, minute by minute
Replay
Replay this night’s sky in the simulator — from the archive’s eight Kp values