2015-09-11 · historical storm
Historical snapshot — data recorded on 2026-08-12, not live
Space weather — 2015-09-11
Daily Statistics Brief
On 2015-09-11, the planetary Kp index peaked at 8.0 (G5 extreme). solar wind speed reached 760 km/s and Bz dipped to -22 nT. Auroral hemispheric power was 290 GW. The Dst index reached -195 nT.
Aurora Oval — Peak Kp 8.0
Severe storm — aurora visible at mid-latitudes.
Auroral power: 290 GW
Kp max8.0Kp now8.0Wind760 km/sBz-22 nTAurora290 GWDst-195 nTFlare—NEAs0