Space Weather Message: ALERT: Geomagnetic K-index of 7

Space Weather Message Code: ALTK07

Serial Number: 90

Issue Time: 2015 Mar 17 1334 UTC

ALERT: Geomagnetic K-index of 7

Threshold Reached: 2015 Mar 17 1330 UTC

Synoptic Period: 1200-1500 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.