WARNING: Geomagnetic K-index of 7 or greater (G3 or Greater)

By Newsroom America Feeds at 28 Sep 2017

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.

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