Geophysical Alert Message
Issued: 2026 Apr 18 0000 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # # Geophysical Alert Message # Solar-terrestrial indices for 17 April follow. Solar flux 107 and estimated planetary A-index 4. The estimated planetary K-index at 0000 UTC on 18 April was 2.33. No space weather storms were observed for the past 24 hours. Space weather for the next 24 hours is predicted to be moderate. Geomagnetic storms reaching the G2 level are likely.
https://www.swpc.noaa.gov/news/g2-moderate-geomagnetic-storm-watches-17-18-april
Coos County Radio Club 