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Schematic of the SWA-EAS sensor. The rectilinear box houses sensor electronics and provides orthogonal mounting for two cylindrical sensor heads comprising an aperture deflection subsystem, a hemispherical electrostatic analyser subsystem, an annular microchannel plate detector/anode subsystem. Each head accumulates counts of electrons in 64 energy bins (∼1 eV to ∼5 keV) arriving from each of 16 elevation directions(±45°) and 32 azimuth directions (0° ≤ϕ < 360°). Accumulation time for a full 3D data product is ∼1 s (see Owen et al. 2020 for further details).
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