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EP: Fachverband Extraterrestrische Physik
EP 9: Sun and Heliosphere III
EP 9.6: Vortrag
Donnerstag, 19. März 2026, 15:00–15:15, KH 01.019
Cross calibration of SOHO ∼ 1 GV proton and helium fluxes with PAMELA and AMS-02 — Malte Hörlöck1, •Bernd Heber1, Marlon Köberle1, Patrick Kühl1, Lisa Romaneesen1, and Athanasios Papaioannou2 — 1Christian-Albrechts-Universität zu Kiel (CAU), Kiel, Germany — 2National Observatory of Athens, Greece
Reliable measurements of Galactic Cosmic Rays (GCRs) and Solar Energetic Particles (SEPs) require well-calibrated spaceborne particle instruments. This study presents a cross-calibration of the Electron, Proton and Helium Instrument (EPHIN) aboard SOHO with high-precision proton and helium measurements from PAMELA and AMS-02. The analysis extends the established Δ E–Δ E technique to later mission phases, accounting for detector aging and changes in instrument response after 2017.
A GEANT4-based model of EPHIN, including a simplified representation of the SOHO spacecraft, is used to derive energy response functions for penetrating protons and helium nuclei. Simulated detector responses based on force-field*modulated GCR spectra reproduce the observed EPHIN energy-loss distributions within about 30%. Effective energies and fluxes are obtained using a bow-tie inversion method and compared with AMS-02 and PAMELA observations during quiet solar conditions. The results show agreement within the combined systematic uncertainties, demonstrating that SOHO/EPHIN continues to provide valuable and reliable energetic particle measurements for long-term heliospheric studies.
Keywords: Galactic cosmic rays; Modulation; Measurements