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F.Valdés-GaliciaVALLANIA, PIEROPIEROVALLANIAVankova, G.G.VankovaVigorito, C.C.VigoritoVillaseñor, L.L.VillaseñorVlcek, B.B.Vlcekvon Ballmoos, P.P.von BallmoosVrabel, M.M.VrabelWada, S.S.WadaWatanabe, J.J.WatanabeWatanabe, S.S.WatanabeWatts, J.J.WattsWeber, M.M.WeberWeigand Muñoz, R.R.Weigand MuñozWeindl, A.A.WeindlWeiler, T. J.T. J.WeilerWibig, T.T.WibigWiencke, L.L.WienckeWille, M.M.WilleWilms, J.J.WilmsWłodarczyk, Z.Z.WłodarczykYamamoto, T.T.YamamotoYamamoto, Y.Y.YamamotoYang, J.J.YangYano, H.H.YanoYashin, I. V.I. V.YashinYonetoku, D.D.YonetokuYoshida, S.S.YoshidaYoung, R.R.YoungZgura, I. S.I. S.ZguraZotov, M. Yu.M. Yu.ZotovZuccaro Marchi, A.A.Zuccaro Marchi2020-09-172020-09-1720170168-9002http://hdl.handle.net/20.500.12386/27441JEM-EUSO is a space mission designed to investigate Ultra-High Energy Cosmic Rays and Neutrinos (E > 5 ⋅ 10<SUP>19</SUP> eV) from the International Space Station (ISS). Looking down from above its wide angle telescope is able to observe their air showers and collect such data from a very wide area. Highly specific trigger algorithms are needed to drastically reduce the data load in the presence of both atmospheric and human activity related background light, yet retain the rare cosmic ray events recorded in the telescope. We report the performance in offline testing of the first level trigger algorithm on data from JEM-EUSO prototypes and laboratory measurements observing different light sources: data taken during a high altitude balloon flight over Canada, laser pulses observed from the ground traversing the real atmosphere, and model landscapes reproducing realistic aspect ratios and light conditions as would be seen from the ISS itself. The first level trigger logic successfully kept the trigger rate within the permissible bounds when challenged with artificially produced as well as naturally encountered night sky background fluctuations and while retaining events with general air-shower characteristics.STAMPAenArticle10.1016/j.nima.2017.05.0432-s2.0-85021224738000407863700020https://www.sciencedirect.com/science/article/pii/S016890021730596X?via%3Dihub2017NIMPA.866..150AFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation