Severe Solar Radiation Storm Triggers Space Weather Alerts
NOAA reports a rare S4 (Severe) solar radiation storm in progress as of January 19, 2026, with GOES-19 measurements indicating intensification. The storm poses increased radiation exposure risks for astronauts and polar flights, potential satellite and space-launch impacts, and possible loss of over-the-horizon HF communications in polar regions; agencies including airlines, FAA, NASA, FEMA, and NERC have been notified as conditions evolve.