Göttingen 2025 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 12: Sun and Heliosphere V
EP 12.4: Vortrag
Donnerstag, 3. April 2025, 17:15–17:30, ZHG101
Modulation of 1 GV protons - comparison of SOHO/EPHIN to AMS-02 fluxes — Bernd Heber1, •Malte Hörlöck1, Stefan Jensen1, Patrick Kühl1, Lisa Romaneehsen1, and Holger Sierks2 — 1Christian-Albrechts-Universität Kiel, Kiel, D — 2Max-Planck-Institut für Sonnensystemforschung, Göttingen, D
The Electron Proton Helium INstrument (EPHIN) aboard SOHO is designed to measure high-energy particles and is operating since 1995. It provides energy spectra of protons in the energy range from 4 to about 800 MeV. Above 50 MeV the dE/dx−dE/dx- and Bowtie-method is used to determine the energy dependent flux. To validate the measurements, we used published proton fluxes from 2011 to 2019 obtained by the Alpha Magnetic Spectrometer (AMS-02) which is a state-of-the-art particle physics detector designed to study cosmic rays and provides proton fluxes from ≈ 400 MeV to 100 GeV. Here we present the methods and their results that lead to an agreement with AMS-02 within 20% for protons with energies between 400 and 700 MeV. This work received funding from the BMWI (50OC2302,50OC2404) and the EU (101135044 - SPEARHEAD).
Keywords: Cosmic rays; Proton flux measurements; Modulation