|Instrument: SSI/E : Ionospheric Plasma Monitor (SSI/E)|
Solar/Space Observing Instruments
Instrument Class: Particle Detectors
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[Source: National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1977-044A-05 ]
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.
Instrument Owner: United States Air Force