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Ionospheric Plasma Monitor (SSI/E)

NSSDCA ID: 1977-044A-05

Mission Name: DMSP 5D-1/F02
Principal Investigator:Dr. Rita C. Sagalyn


The instrument consisted of one spherical (SEA) and one planar (PEA) electrostatic analyzer. The SEA provided measurements of electron densities from 10 to 1.E6/cubic cm in the temperature range from 200 to 15,000 deg k. The PEA measured ion temperatures in the same range as well as the average ion mass over the range 1 to 35 u. The PEA was oriented in the direction of the positive spacecraft velocity vector, while the SEA was oriented at right angles to this direction and away from the sun to minimize the effect of photoelectrons. The device also provided a measurement of the spacecraft potential.

Alternate Names

  • DMSP5D-1-F02/SSI/E
  • Ionospheric Plasma Monitor
  • SSI/E


  • 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. Rita C. SagalynPrincipal InvestigatorPhillips Laboratory (nee USAF Geophysics Lab, nee Cambridge Labs)
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