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Instrument: SSJ/4 : Precipitating Electron/Ion Spectrometer
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Associated Platforms
DMSP 5D-2/F7
DMSP 5D-2/F8
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Related Data Sets
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[Source: National Space Science Data Center, ]

The purpose of the precipitating electron/ion spectrometer, SSJ/4, is to measure fluxes and energies of electrons and ions precipitated into the upper atmosphere. Particles are separated by an electrostatic analyzer into 20 energy bands from 30 eV to 30 keV: (1) 10 high-energy levels, 0.948, 1.39, 2.04, 3.00, 4.40, 6.46, 9.48, 13.92, 20.44 and 30.00 keV; and (2) 10 low-energy levels, 30.0, 44.0, 64.6, 94.9, 139.2, 204.4, 300, 440, 646, and 948 eV. Channeltrons are used to count the impinging electrons and ions in each energy band.

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Instrument Logistics
Instrument Owner: Department of Defense-Department of the Air Force (United States)

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