München 2019 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 1: Sun and Heliosphere I
EP 1.7: Talk
Monday, March 18, 2019, 18:15–18:30, HS 19
Velocity Dispersion Analysis of Corrected SEPT Electron Measurements — •Alexander Kollhoff1, Nina Dresing1, Andreas Klassen1, Raúl Gómez-Herrero2, and Bernd Heber1 — 1Institut für Experimentelle und Angewandte Physik, University of Kiel — 2Dpto. de Física y Matemáticas, Universidad de Alcalá
Solar energetic particle events with an impulsive intensity time profile are dominated 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 Solar Electron and Proton Telescope (SEPT) aboard the Solar TErrestrial RElations Observatory (STEREO) are utilised in the solar heliospheric community to investigate electron 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 flattened as a result of the velocity dispersion. 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. These analyses suggest a longer particle path and an earlier injection time compared to uncorrected measurements.