ALERT: Geomagnetic K-index of 6

Space Weather Message Code: ALTK06 Serial Number: 449 Issue Time: 2017 Sep 27 2222 UTC

ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 Sep 27 2220 UTC

Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G2 - Moderate NOAA Space Weather

Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.

Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.

Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.

Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.