Würzburg 2018 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 8: Poster Session
EP 8.5: Poster
Wednesday, March 21, 2018, 17:00–18:30, BSZ - Pabel HS
Interpretation of solar energetic particle flux increases as measured with SEPT aboard the STEREO spacecraft in the presence of contamination — S. Wraase1, •B. Heber1, S. Böttcher1, R. Bucik2, N. Dresing1, R. Goméz-Herrero3, A. Klassen1, and R. Müller-Mellin1 — 1Christian-Albrechts-Universität zu Kiel, Germany — 2Georg-August-Universität Göttingen, Germany — 3Universidad de Alcalá, Madrid, Spain
Among others, shocks are known to be accelerators of energetic charged particles. However, the acceleration efficiency and the required conditions are not fully understood and many questions remain. In particular, the acceleration of electrons by shocks is often questioned. Recurrent energetic particle events (REPE) are caused by the passage of Corotating Interaction Regions (CIRs). Measurements of the Solar Electron and Proton Telescope (SEPT) aboard STEREO are utilized to investigate the electron event on August 9, 2011. Due to its measurement principle, the magnet foil technique, ions can contribute to the electron channels. During REPEs the averaged helium to proton ratio is enhanced to more than 10% with energy per nucleon spectra following a Band function. Computations using a GEANT4 simulation of the SEPT instrument resulted in response functions for ions and electrons. These have been utilized to analyze the above mentioned event. We found that electron and ion measurements can be explained by the contribution of helium and protons with a helium to proton ratio of about 16%. Thus no electron enhancements are needed to explain the SEPT measurements.