Magnetic Field/Electric Field Instruments
3DA
The 3D-Plasma Analyzer (3DA) instrument on EQUATOR-S consists of an electron electrostatic analyzer (EESA) and an ion electrostatic analyzer (PESA). The analyzer is a symmetrical spherical-section electrostatic analyzer (top-hat design) with a disc-shaped field of view (FOV) of 180¡ directed perpendicular to the spacecraft body. The complete solid-angle sphere is thus covered in one spin period of 1.5 s. The analyzers measure electron and ion distribution functions in 192 angle and 56 energy channels, in the energy-per-charge range 10 eV - 25 keV. Moments of the distributions are computed on board. The 3DA instrument (together with the EPI instrument) is a derivative of the 3D Plasma and Energetic Particle Instrument on the WIND spacecraft. See: http://www.mpe-garching.mpg.de/EQS/eq-s-instruments.html