Bartocci, S.S.BartocciBattiston, R.R.BattistonBurger, W. J.W. J.BurgerCampana, D.D.CampanaCarfora, L.L.CarforaCastellini, G.G.CastelliniConti, L.L.ContiContin, A.A.ContinDe Donato, C.C.De DonatoDe Persio, F.F.De PersioDe Santis, C.C.De SantisDIEGO, PieroPieroDIEGOFollega, F. M.F. M.FollegaIuppa, R.R.IuppaLazzizzera, I.I.LazzizzeraMarcelli, N.N.MarcelliMartucci, M.M.MartucciMasciantonio, G.G.MasciantonioMerge, M.M.MergeOsteria, G.G.OsteriaPalma, F.F.PalmaPalmonari, F.F.PalmonariPARMENTIER, AlexandraAlexandraPARMENTIERPerfetto, F.F.PerfettoPicozza, P.P.PicozzaPiersanti, M.M.PiersantiPozzato, M.M.PozzatoRashevskaya, I.I.RashevskayaRicci, E.E.RicciRicci, M.M.RicciRicciarini, S.S.RicciariniScotti, V.V.ScottiSotgiu, A.A.SotgiuSparvoli, R.R.SparvoliUbertini, P.P.UbertiniVitale, V.V.VitaleZoffoli, S.S.ZoffoliZuccon, P.P.Zuccon2025-02-202025-02-2020200004-637Xhttp://hdl.handle.net/20.500.12386/36111The High-energy Particle Detector (HEPD) on board the China Seismo-Electromagnetic Satellite (CSES-01)—launched on 2018 February 2—is a light and compact payload suitable for measuring electrons (3–100 MeV), protons (30–250 MeV), and light nuclei (up to a few hundreds of MeV). The Sun-synchronous orbit and large acceptance allow HEPD to measure cosmic-ray particles near the ±65° latitude limit for a fair amount of time per day. In this work, three semiannual galactic hydrogen energy spectra between ∼40 and 250 MeV are presented, including a comparison with theoretical spectra from HelMod, a 2D Monte Carlo model developed to simulate the solar modulation of cosmic rays throughout the heliosphere. To our knowledge, these are the first hydrogen energy spectra below 250 MeV measured at 1 au between 2018 and 2020.STAMPAenArticle10.3847/1538-4357/ABAD3EWOS:000573543500001https://iopscience.iop.org/article/10.3847/1538-4357/abad3ehttps://publons.com/wos-op/publon/34168195/FIS/05 - ASTRONOMIA E ASTROFISICA