Adriani, O.O.AdrianiAkaike, Y.Y.AkaikeAsano, K.K.AsanoAsaoka, Y.Y.AsaokaBagliesi, M. G.M. G.BagliesiBigongiari, G.G.BigongiariBinns, W. R.W. R.BinnsBonechi, S.S.BonechiBongi, M.M.BongiBrogi, P.P.BrogiBuckley, J. H.J. H.BuckleyCannady, N.N.CannadyCastellini, G.G.CastelliniChecchia, C.C.ChecchiaCherry, M. L.M. L.CherryCollazuol, G.G.Collazuoldi Felice, V.V.di FeliceEbisawa, K.K.EbisawaFuke, H.H.FukeGuzik, T. G.T. G.GuzikHams, T.T.HamsHareyama, M.M.HareyamaHasebe, N.N.HasebeHibino, K.K.HibinoIchimura, M.M.IchimuraIoka, K.K.IokaIshizaki, W.W.IshizakiPenacchioni, Ana VirginiaAna VirginiaPenacchioniet al.2020-09-172020-09-172017-11-01https://hdl.handle.net/20.500.13025/5331Physical Review Letters, Volume 119, Issue 18, id.181101First results of a cosmic-ray electron and positron spectrum from 10 GeV to 3 TeV is presented based upon observations with the CALET instrument on the International Space Station starting in October, 2015. Nearly a half million electron and positron events are included in the analysis. CALET is an all-calorimetric instrument with total vertical thickness of 30 X<SUB>0</SUB> and a fine imaging capability designed to achieve a large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum over 30 GeV can be fit with a single power law with a spectral index of -3.152 0.016 (stat+syst ). Possible structure observed above 100 GeV requires further investigation with increased statistics and refined data analysis.journal article10.1103/PhysRevLett.119.181101http://adsabs.harvard.edu/abs/2017PhRvL.119r1101A2017PhRvL.119r1101A