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EP: Fachverband Extraterrestrische Physik

EP 4: Poster Session

EP 4.39: Poster

Tuesday, February 26, 2013, 11:15–12:45, Poster OG

Calculating particle spectra from the Solar Electron and Proton Telescope onboard STEREO — •Jan Gieseler, Stephan Böttcher, Bernd Heber, and Jan Köhler — IEAP, CAU Kiel, Kiel, Germany

STEREO (Solar TErrestrial RElations Observatory) was launched on October 26, 2006. It consists of two spacecraft on heliocentric orbits, one preceding the Earth, the other following it. The Solar Electron and Proton Telescope (SEPT) onboard each of the two spacecraft is made up of two dual double-ended magnetic/foil particle telescopes which separate and measure electrons (from 30 to 400 keV) and ions, mainly protons and α-particles (from 70 keV to 2.2 MeV). Low energy ions are stopped by the thin foil which electrons can pass with an essentially unaltered spectrum. The magnet on the other side deflects electrons while ions still reach the detector. Up to now, SEPT energy spectra were obtained using defined energy channels from accelerator calibration measurements and geometric factors derived from Monte Carlo simulations. We try a different approach, applying inversion methods to calculate the energy spectra from the measurements, expecting higher accuracy and better separation of the different particle populations.