ALERT: Geomagnetic K-index of 7
Threshold Reached: 2015 Mar 17 2030 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G3 – Strong
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.
2015 Mar 17 1505 UTC
Solar-terrestrial indices for 16 March follow.
Solar flux 117 and estimated planetary A-index 11.
The estimated planetary K-index at 1500 UTC on 17 March was 8.
Space weather for the past 24 hours has been severe.
Geomagnetic storms reaching the G4 level occurred.
Space weather for the next 24 hours is predicted to be severe.
Geomagnetic storms reaching the G4 level are expected.
Solar radiation storms reaching the S1 level are expected.
Radio blackouts reaching the R1 level are likely.p>