H. Nesse Tyssøy, M. Sinnhuber, T. Asikainen, S. Bender, M. Clilverd, B. Funke, M. v. de Kamp, J. Pettit, C. Randall, T. Reddmann, C. Rodger, E. Rozanov, C. Smith-Johnsen, T. Sukhodolov, P. Verronen, J. M. Wissing, O. Yakovchuk, HEPPA III intercomparison experiment on electron precipitation impacts: Estimated ionization rates during a geomagnetic active period in April 2010, AGU Fall Meeting, New Orleans, US, Dec. 13-17, 2021