ALERT: Geomagnetic K-index of 7 (G3)

Space Weather Message Code: ALTK07

Serial Number: 88 Issue

Time: 2014 Sep 12 2309 UTC

ALERT: Geomagnetic K-index of 7

Threshold Reached: 2014 Sep 12 2302 UTC

Synoptic Period: 2100-2400 UTC

Active Warning: Yes

NOAA Scale: G3 – Strong

NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/NOAAscales 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.