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Kiel 2004 – scientific programme

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EP: Extraterrestrische Physik

EP 6: Zukünftige Missionen

EP 6.1: Fachvortrag

Thursday, March 11, 2004, 11:30–11:50, C

The Solar Electron Proton Telescope for STEREO — •S. Böttcher1, R. Müller-Mellin1, and L. Duvet21IEAP CAU Kiel, 24118 Kiel, Germany — 2ESA ESTEC, Noordwijk, Netherlands

STEREO is a pair of spacecraft that will be launched in 2005, as part of NASA’s Solar Terrestrial Probes Program. STEREO will observe Coronal Mass Ejections (CME) with a stereometric view from two points in earth-like orbits around the Sun. We present the design of the Solar Electron Proton Telescope (SEPT), which is part of the instrument for In-situ Measurements of Particles and CME Transients (IMPACT) onboard STEREO. SEPT employs solid state silicon detectors to measure particle fluxes in the kinetic energy range 30–400 keV (60–7000 keV) for electrons (protons), with a geometry factor of 0.52 (0.68)  cm2 sr. Particle identification is accomplished via magnetic filters made of NdFeB permanent magnets that deflect electrons from the proton counters, and foils that filter low energy protons in front of the electron counters. The readout electronics is built around an integrated Particle Detector Front-End chip, which allows to meet the power and mass allocated to the instrument. The energy and time resolution of the particle spectra is limited by the telemetry allocation, which allows to transmit counts for 32 logarithmic energy bins every minute. Each STEREO spacecraft carries two SEPT units, viewing along the magnetic field lines in the ecliptic plane, and perpendicular to the ecliptic plane, respectively.

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