####018001132#### WOXX14 KWNP 190601 ALTK07 Space Weather Message Code: ALTK07 Serial Number: 136 Issue Time: 2023 Sep 19 0559 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Sep 19 0559 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G3 - Strong 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. # Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Recent messages, data, and help at http://swpc.noaa.gov/alerts/ # Send questions to SWPC.Webmaster@noaa.gov