Geomagnetic Storm Warning - Extreme

Space Weather Message Code: WARK07 Serial Number: 46

Issue Time: 2015 Mar 17 1216 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2015 Mar 17 1215 UTC Valid To: 2015 Mar 17 1700 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.