WOXX31 KWNP 211906 ALTPC0 Space Weather Message Code: ALTPC0 Serial Number: 53 Issue Time: 2024 Nov 21 1903 UTC ALERT: Proton Event 100MeV Integral Flux exceeded 1pfu Begin Time: 2024 Nov 21 1855 UTC www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact. # Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Recent messages, data, and help at http://swpc.noaa.gov/alerts/ # Send questions to SWPC.Webmaster@noaa.gov