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The 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 250MeV 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 250MeV measured at 1 au between 2018 and 2020. Unified Astronomy Thesaurus concepts: Heliosphere (711); Cosmic rays (329); Cosmic ray detectors (325)

astrophysical journal/the astrophysical journal

Galactic Cosmic-Ray Hydrogen Spectra in the 40–250 MeV Range Measured by the High-energy Particle Detector (HEPD) on board the CSES-01 Satellite between 2018 and 2020