Space Weather Message Code: ALTK07
Serial Number: 85
Issue Time: 2012 Mar 09 1033 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2012 Mar 09 1028 UTC
Synoptic Period: 0900-1200 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
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.