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EP: Fachverband Extraterrestrische Physik
EP 3: Poster session
EP 3.10: Poster
Dienstag, 31. März 2020, 16:30–18:30, Zelt
Velocity Dispersion Analysis of Corrected SEPT Electron Measurements — Alexander Kollhoff1, Nina Dresing1, Raul Gomez-Herrero2, •Bernd Heber1, Konstantin Herbst1, and Andreas Klassen1 — 1Christian-Albrechts-Universität Kiel — 2Universidad de Alcalá, Alcalá de Henares, Spain
SEP events with an impulsive intensity time profile are often accompanied by electrons with energies up to a few hundred keV. The velocity dispersion of these electrons, observed at 1 AU, can provide information about how they are injected and transported through the inner heliosphere. Measurements of the SEPT aboard the STEREO are often used to investigate electrons in SEP events. Due to the instrumental setup, energetic electrons can scatter out of the solid state detector, depositing less than their total energy. Therefore, each SEPT electron channel has a response to electrons with energies above its nominal energy range. This effect of contamination becomes especially significant during the rise time of SEP events, when the energy spectrum is flatter due to velocity dispersion and leading to seemingly earlier onsets in some energy channels. Computation using a GEANT4 simulation of the SEPT instrument resulted in new response functions for electrons. These response functions are used to correct the contamination of highly energetic electrons to lower electron channels. The corrected intensities are used to analyse the velocity dispersion of several SEP events. The corrected data lead to significant different onset times and with it to more realistic path length and injection times compared to uncorrected measurements.