2021-09-27 · historical storm
Historical snapshot — data recorded on 2026-08-12, not live
Space weather — 2021-09-27
Daily Statistics Brief
On 2021-09-27, the planetary Kp index peaked at 6.0 (G3 strong). solar wind speed reached 610 km/s and Bz dipped to -11 nT. Auroral hemispheric power was 230 GW. The Dst index reached -72 nT.
Aurora Oval — Peak Kp 6.0
Active storm — aurora oval expanded equatorward.
Auroral power: 230 GW
Kp max6.0Kp now6.0Wind610 km/sBz-11 nTAurora230 GWDst-72 nTFlare—NEAs0