An Instrument for the Measurement of Charged Particles in the Aurora

A single electrostatic analyzing instrument has been developed that allows multiple channel energy analysis for both protons and electrons. Circuitry for this instrument maximizes temporal resolution with telemetry bandwidths over a 5 decade count rate range. The instrument measures energies of 1 to 20 keV in 5 energy intervals at count rates of 1 to 105 counts/sec with a maximum temporal resolution of 10-2 seconds.