ALERT: Geomagnetic K-index of 7 (G3)

By Newsroom America Feeds at 28 May 2017

Space Weather Message Code: ALTK07 Serial Number: 105 Issue Time: 2017 May 28 0420 UTC

ALERT: Geomagnetic K-index of 7 Threshold Reached: 2017 May 28 0419 UTC Synoptic Period: 0300-0600 UTC

Active Warning: Yes NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at

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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