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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
DMSP 5D-2/F9
DMSP 5D-2/F10
DMSP 5D-2/F11
DMSP 5D-2/F12
DMSP 5D-2/F13
DMSP 5D-2/F14
DMSP 5D-3/F15

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.

Online Resources

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