The Solar Electron and Proton Telescope for the STEREO Mission

Details The Solar Electron and Proton Telescope for the STEREO Mission The Solar Electron and Proton Telescope for the STEREO Mission

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ssrv..136..363m&link_type=abstract

Space Science Reviews, Volume 136, Issue 1-4, pp. 363-389

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Solar Energetic Particles, Cme, Acceleration, Propagation, Instrumentation

Scientific paper

The Solar Electron and Proton Telescope (SEPT), one of four instruments of the Solar Energetic Particle (SEP) suite for the IMPACT investigation, is designed to provide the three-dimensional distribution of energetic electrons and protons with good energy and time resolution. This knowledge is essential for characterizing the dynamic behaviour of CME associated and solar flare associated events. SEPT consists of two dual double-ended magnet/foil particle telescopes which cleanly separate and measure electrons in the energy range from 30 400 keV and protons from 60 7 000 keV. Anisotropy information on a non-spinning spacecraft is provided by the two separate telescopes: SEPT-E looking in the ecliptic plane along the Parker spiral magnetic field both towards and away from the Sun, and SEPT-NS looking vertical to the ecliptic plane towards North and South. The dual set-up refers to two adjacent sensor apertures for each of the four view directions: one for protons, one for electrons. The double-ended set-up refers to the detector stack with view cones in two opposite directions: one side (electron side) is covered by a thin foil, the other side (proton side) is surrounded by a magnet. The thin foil leaves the electron spectrum essentially unchanged but stops low energy protons. The magnet sweeps away electrons but lets ions pass. The total geometry factor for electrons and protons is 0.52 cm2 sr and 0.68 cm2 sr, respectively. This paper describes the design and calibration of SEPT as well as the scientific objectives that the instrument will address.

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