Revisited Reference Solar Proton Event of 23 February 1956: Assessment of the Cosmogenic‐Isotope Method Sensitivity to Extreme Solar Events - Usoskin, Ilya G.; Koldobskiy, Sergey A.; Kovaltsov, Gennady A.; Rozanov, Eugene V.; Sukhodolov, Timofei V.; Mishev, Alexander L.; Mironova, Irina A. (Journal of geophysical research. Space physics, 2020)
Keywords: cosmogenic isotopes; extreme events; solar energetic particles