Space Weather Message Code: WARK07
Serial Number: 73
Issue Time: 2017 Sep 28 0537 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2017 Sep 28 0536 UTC
Valid To: 2017 Sep 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater – Strong to Extreme
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.