ALERT: Geomagnetic K-index: 7 (G3)

Space Weather Message Code: ALTK07
Serial Number: 117
Issue Time: 2021 Nov 04 0001 UTC

ALERT: Geomagnetic K-index: 7
Threshold Reached: 2021 Nov 03 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: YES!
NOAA Scale: G3 – Strong

NOAA Space Weather Scale descriptions can be found at 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.

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