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Space Environment Monitor (SEM)

NSSDCA ID: 1991-032A-04

Mission Name: NOAA 12
Principal Investigators:Dr. Herbert H. Sauer
Principal Investigators:Dr. Harold Leinbach
Principal Investigators:Dr. David S. Evans


The Space Environmental Monitor (SEM) experiment is an extension of the solar-proton monitoring experiment flown on the ITOS spacecraft series. The object is to measure proton flux, electron flux density, and energy spectrum in the upper atmosphere. The experiment package consists of two detector systems and a data processing unit. The medium energy proton and electron detector (MEPED) measures protons in five energy ranges from 30 keV to >2.5 MeV; electrons above 30, 100, and 300 keV; protons and electrons (inseparable) above 6 MeV; and omni-directional protons above 16, 36, and 80 MeV. The total energy detector (TED) measures the intensity of protons and electrons between 300 eV and 20 keV.

Alternate Names

  • NOAA12/SEM
  • SEM


  • 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. David S. EvansPrincipal InvestigatorNOAA Environmental Research
Dr. Harold LeinbachPrincipal InvestigatorNOAA Environmental Research Laboratories
Dr. Herbert H. SauerPrincipal InvestigatorNOAA Environmental Research
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