This market will resolve to "Yes" if a solar radiation storm with a severity level of 3 or greater occurs between market creation and April 30, 2026, 11:59PM ET. Otherwise, this market will resolve to "No". An S3 event is a solar radiation storm with a "Strong" classification. More information on the space weather classification criteria can be found here: https://www.swpc.noaa.gov/noaa-scales-explanation This market will resolve immediately upon the occurrence of a qualifying event. Any later revisions or corrections will not be considered. This market will resolve based on information from the National Oceanic and Atmospheric Administration's Space Weather Prediction Center under the heading marked "Current Space Weather Conditions". (https://www.swpc.noaa.gov/products/alerts-watches-and-warnings#) If the resolution source becomes permanently unavailable, this market will resolve to "No".