Göttingen 2025 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 12: Sun and Heliosphere V
EP 12.5: Vortrag
Donnerstag, 3. April 2025, 17:30–17:45, ZHG101
Energy spectra of 300 keV to 1 MeV electrons from the SOHO Electron Proton Helium INstrument (EPHIN) — •Stefan Jensen1, Bernd Heber1, Alexander Kollhoff1, Patrick Kühl1, and Holger Sierks2 — 1Institut für Experimentelle und Angewandte Physik, Christian Albrechts-Universität zu Kiel, Germany — 2Max Planck-Institut für Sonnensystemforschung, Göttingen, Germany
The origins of energetic electrons with energies ranging from a few tens of keV to tens of MeV in the inner heliosphere are manifold. They include Galactic Cosmic Rays, Jovian electrons as well as sporadic Solar Energetic Electron (SEE) events. Their energy spectra provide insights into the acceleration at the source and transport processes in the heliosphere. The SOlar and Heliospheric Observatory (SOHO) was launched December 1995 with the Electron Proton Helium INstrument (EPHIN) measuring electrons from 150 keV to several MeV. However, its measuring capability was reduced due to the failure of two detectors in 1997 and 2017, respectively. Thus from 2017 onwards only two electron channels, one in the range from 150 keV to one MeV and one broad channel that measures between 300 keV and 10 MeV. In this contribution we present a new data product for electron spectra based on the onboard histograms. This data product has the advantage of providing the total energy loss in the first two detectors with good statistics compromising energy resolution and counting statistics. Using the bow-tie method we were able to derive the flux in several energy channels between 300 keV and about 1 MeV. We present first results and compare them with instruments from other missions.
Keywords: Solar energetic electrons; Energy spectra