PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Direct, CRD)
Galactic Cosmic Ray Observations with the High Energy Particle Detector (HEPD-01) on board the CSES-01 Satellite
A. Sotgiu* and B. Panico
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Pre-published on: July 25, 2023
Published on:
The High-Energy Particle Detector (HEPD-01) is one of the payloads onboard the China Seismo-
Electromagnetic Satellite (CSES-01), launched in February 2018 and still operating. The detector
is a light and compact payload suitable for measuring electrons (3-100 MeV), protons (30-300
MeV), and light nuclei (up to a few hundred MeV/nucleon). The wide angular acceptance of
HEPD-01, and the polar orbit of the satellite, allow for the measurement of galactic particle spectra
also on a daily basis for protons. We present here some results concerning the measurement of
galactic proton spectra between 40 and 250 MeV, together with a first preliminary measurement
of galactic helium nuclei between 60 and 200 MeV/nucleon, obtained from the data collected
in the first months of flight. The data-analysis techniques used to reconstruct helium fluxes are
presented for the first time, and the clear particle separation of the two species inside the detector
is shown. A comparison of HEPD-01 data with theoretical spectra obtained with Monte Carlo
model is also presented. Proton-to-helium flux ratio at different energies is particularly important
as the mass-to-charge ratio of the two particles is very different and it is a good probe for the study
of cosmic-ray propagation and injection spectra.
DOI: https://doi.org/10.22323/1.444.0114
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