@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/5f5e4f2c-61b7-4694-8680-3fc5799f6171>
  skos:prefLabel "Particle Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/4d2b0afb-7bcf-4168-b4b9-3c8a85b0a6e4> .

<https://gcmd.earthdata.nasa.gov/kms/concept/4d2b0afb-7bcf-4168-b4b9-3c8a85b0a6e4>
  ns0:altLabel [ ] ;
  skos:definition """[Source: National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1990-105A-03 ]

The primary purpose of the ionospheric/scintillation monitor, SSI/ES, is to measure electron density and temperature, hydrogen and oxygen ion density and temperature, the power spectrum of plasma irregularities, and the velocity components of bulk plasma flow at satellite altitude. The experiment consists of four sensors. The electrostatic analyzer measures electron parameters at least 1 m above the satellite surface. The ion retarding potential analyzer has a body-mounted electrostatic trap with a circular aperture to measure ion density and temperature. The driftmeter uses a planar electrostatic ion trap with a four-quadrant collector. The current is measured in pairs of quadrants and differenced to provide plasma drift velocities. The scintillation monitor obtains power spectrum irregularities by an ion trap with electrometer and amplifiers capable of measuring direct and alternating current in the frequency range from 20 Hz to 12 kHz.


Group: Instrument_Details
   Entry_ID: SSI/ES
   Group: Instrument_Identification
      Instrument_Category: Solar/Space Observing Instruments
      Instrument_Class: Particle Detectors
      Short_Name: SSI/ES
      Long_Name: Special Sensor Ionospheric Plasma Monitor
   End_Group
   Group: Associated_Platforms
      Short_Name: DMSP 5D-3/F15
      Short_Name: DMSP 5D-2/F11
      Short_Name: DMSP 5D-2/F10
      Short_Name: DMSP 5D-2/F9
      Short_Name: DMSP 5D-2/F8
   End_Group
   Group: Spectral_Frequency_Information
      Spectral_Frequency_Coverage_Range: 20 Hz to 12 kHz
   End_Group
   Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1990-105A-03
   Creation_Date: 2008-09-26
   Group: Instrument_Logistics
      Instrument_Owner: Department of Defense-Department of the Air Force (United States)
   End_Group
End_Group"""@en ;
  skos:prefLabel "SSI/ES"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/5f5e4f2c-61b7-4694-8680-3fc5799f6171> ;
  a skos:Concept .