A planar energy spectrometer for the study of energy distributions of electron and proton fluxes

The paper describes a satellite instrument for the investigation of the energy spectra of electrons and protons with energies from 0.1 to 20 keV precipitating into the ionosphere. The sensor employed is an electrostatic analyzer with a system of channel electron multipliers operating in the pulse-counting mode. For the transformation of the count rate into differential particle flux intensity, an experimental determination was made of the energy-geometric coefficient and the efficiency of registration of charged particles at the output of the analyzer for each channel multiplier. Attention is given to the design and basic characteristics of this instrument, which was successfully used on the Cosmos-900 satellite.