Space Weather Message Code: ALTK07

Serial Number: 119

Issue Time: 2021 Nov 04 0934 UTC

ALERT: Geomagnetic K-index of 7

Threshold Reached: 2021 Nov 04 0934 UTC

Synoptic Period: 0900-1200 UTC

Active Warning: Yes

NOAA Scale: G3 - Strong

Potential Impacts

• Area of impact primarily pole-ward 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.

• Surface charging may occur on satellite components

• Corrections may be needed for orientation problems.

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.

https://www.swpc.noaa.gov/products/alerts-watches-and-warnings#