ALERT: Geomagnetic K-index of 7 (G3) 2021 May 12 1759 UTC (link corrected)

Space Weather Message Code: ALTK07
Serial Number: 116
Issue Time: 2021 May 12 1759 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2021 May 12 1759 UTC
Synoptic Period: 1500-1800 UTC 

Active Warning: Yes
NOAA Scale: G3 – Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.

Induced Currents – Power system voltage irregularities possible, false alarms may be triggered on some protection devices.

Spacecraft – Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.

Navigation – Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.

Radio – HF (high frequency) radio may be intermittent.

Aurora – Aurora may be seen as low as Pennsylvania to Iowa to Oregon.