ALERT: Geomagnetic K-index of 7

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.

Editor's note

Brace for severe weather and significant geological events for next two weeks