Aurora Borealis Viewing It appears as if the Aurora Borealis and Australis are only visible when there is a significant irregular output from the Sun. There is a local alert for people in the very Southern Oz States that they may be able to see Aurora Australis and this information from another source. Aurora USA - Aurora may be seen as low as New York to Wisconsin to Washington state. ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 Apr 22 2359 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.