ALERT: Geomagnetic K-index of 7 (G3)

Space Weather Message Code: ALTK07 Serial Number: 111 Issue Time: 2017 Sep 28 0805 UTC
ALERT: Geomagnetic K-index of 7 Threshold Reached: 2017 Sep 28 0805 UTC Synoptic Period: 0600-0900 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. Thank you for using the Product Subscription Service. If you would like to remove a product subscription or update the personal information in your account, go to: pss.swpc.noaa.gov. Please do not use the from address for correspondence, as it is not monitored. For comments or help, please contact us: pss.help@noaa.gov.

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