Wimmer-Schweingruber, Robert F.; Rodriguez-Pacheco, J.; Lin, R. P.; Mason, G. M.; Heber, B.; Valtonen, E.; Sanchez, S.; Blanco, J.; Prieto, M.; Martin, C.; Ho, G.; Andrews, B.; Burmeister, S.; Boettcher, S.; Kulkarni, S. R.; Seimetz, L.; Schuster, B.
38th COSPAR Scientific Assembly. Held 18-15 July 2010, in Bremen, Germany, p.2
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Multiple processes in the solar atmosphere or near the Sun are capable of energizing electrons and ions which are remotely observed as Solar Energetic Particle (SEP) events. SEP events are of great interest not only because they can cause large radiation increases in the interplanetary space and over the Earth's polar regions, but also because they are part of a broad range of astrophysical sources of energetic particles. Since astrophysical particle accelerators cannot be studied directly, SEPs provide the best opportunity to study all aspects of the problem, namely the acceleration process itself and the ways in which the particles escape the source and travel to remote sites. The Energetic Particle Detector (EPD) addresses two primary science goals of Solar Orbiter: 1) What are the sources of energetic particles and how are they accelerated to high energy? 2) How are solar energetic particles released from their sources and distributed in time? To address these questions, the Energetic Particle Detector (EPD) suite consists of five sensors measuring electrons, protons, and ions from helium to iron, and operating at partly overlapping energy ranges from 2 keV up to 200 MeV/n. The five EPD sensors are the SupraThermal Elec-trons, Ions, Neutrals (STEIN) sensor, the Suprathermal Ion Spectrograph (SIS), the Electron Proton Telescope (EPT), the Low Energy Telescope (LET), and the High Energy Telescope (HET). All sensors share a Common Data Processing Unit (CDPU), and EPT and HET share a common E-Box. EPT/HET and LET consist of two separate sensors with multiple viewing directions. The overall energy coverage achieved with the EPD sensors is 0.002 MeV to 20 MeV for electrons, 0.003 MeV to 100 MeV for protons, 0.008 MeV/n to 200 MeV/n for heavy ions (species-dependent), and 3 keV 30 keV for neutral atoms.