Erlangen 2026 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 9: Sun and Heliosphere III
EP 9.5: Vortrag
Donnerstag, 19. März 2026, 14:45–15:00, KH 01.019
Single Detector Counter Cross-Calibration – SOHO, Chandra/EPHIN, and AMS-02 Results — L. Romaneehsen1, •B. Heber1, M. Dumbović2, M. Hörlöck1, M. Köberle1, P. Kühl1, and A. Papaioannou3 — 1Christian-Albrechts-Universität zu Kiel (CAU), Kiel, Germany — 2University of Zagreb, Faculty of Science, Zagreb, Croatia — 3National Observatory of Athens, Greece
Here we demonstrate that single-detector counter rates from the Electron, Proton, and Helium Instrument (EPHIN) onboard SOHO and Chandra provide a reliable and stable proxy for monitoring Galactic Cosmic Rays (GCRs). Using detailed GEANT4 simulations, the response of the EPHIN SSD-F detector is shown to be dominated by protons and helium nuclei with energies above approximately 50 MeV, corresponding to an effective rigidity of about 2.15 GV.
A direct cross-calibration between SOHO/EPHIN and AMS-02 proton and helium fluxes is performed for the period 2011–2019 and reveals an excellent agreement. Small systematic differences between SOHO and Chandra EPHIN measurements are attributed to different spacecraft geometries and shielding environments. Nevertheless, both instruments show consistent long-term trends and accurately reproduce the solar-cycle modulation of GCRs observed by AMS-02.
This study has received funding from the EU’s Horizon 2020 research and innovation program under grant agreement No. 101004159 (SPEARHeAD). The SOHO/EPHIN is supported under Grant 50 OC 2102 by the German BMFW through DLR.
Keywords: Galactic cosmic rays; Modulation; Measurements