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Precipitating Electron Spectrometer (SSJ/3)

NSSDCA ID: 1977-044A-03

Mission Name: DMSP 5D-1/F02
Principal Investigator:Dr. Paul L. Rothwell


The spectrometer consisted of two different-sized cylindrical electrostatic analyzers (ESA) using channeltron electron multipliers. The ESA's pointed toward the zenith in order to measure precipitating electrons. The large ESA had a field of view (FOV) of 1.6 by 8.0 deg with a delta E/E of 0.04, while the small one had a FOV of 3.7 by 4.8 deg with a delta E/E of 0.072. The large ESA covered the range from 1 to 20 keV and the other one from 50 to 1000 eV. A complete eight-point spectrum from each unit was obtained in 1 s.

Alternate Names

  • DMSP5D-1-F02/SSJ/3
  • Precipitating Electron Spectrometer
  • SSJ/3

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Space Physics: Ionospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Paul L. RothwellPrincipal InvestigatorPhillips Laboratory (nee USAF Geophysics Lab, nee Cambridge Labs)
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