Abstract
An instrument for energy- and mass-spectrum measurements of ion fluxes in the Earth magnetotail is described. The ion selection by energy and mass is provided by sequential analysis of the incident ion beam in the electrostatic field of a cylindrical detector and the field of a permanent magnet. The measurement of ion energy distribution is carried out through scanning the voltage supplied to the electrostatic deflector. At a fixed energy the intensities of the different ion fluxes are measured simultaneously. An electrostatic angular scanner allows for the variation of the direction of the polar view-angle (in a frame of reference with a polar axis coincident with the spin axis of the spacecraft). The scanning of the azimuth angle is obtained while the satellite is spinning. The operational principle and the design of the instrument are described and the results from the laboratory testing are presented.
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