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Energetic Electrons and Protons

NSSDCA ID: 1972-073A-05

Mission Name: IMP-H
Principal Investigator:Dr. Donald J. Williams


The purposes of this investigation were (1) to study the propagation characteristics of solar cosmic rays through the interplanetary medium over the energy ranges indicated below, (2) to study electron and proton fluxes throughout the geomagnetic tail and near the flanks of the magnetosphere, and (3) to study the entry of solar cosmic rays into the magnetosphere. The instrumentation consisted of a three-element telescope employing fully depleted surface-barrier solid-state detectors and a magnet to deflect electrons. Two sidemounted detectors were used to measure the deflected electrons. The experiment was designed to measure: (1) proton fluxes from 30 keV to >8.6 MeV in six ranges; (2) electron fluxes from 30 keV to >450 keV in three ranges; (3) charged particles with E>15 keV; (4) alpha particles >0.5 MeV, >1.6 MeV, 2.2 to 8.8 MeV, and 8.8 to 35 MeV; and (5) charged particles of Z>2 and E>5 MeV. A description of the instrument is given by D. J. Williams in NOAA Technical Report ERL 393-SEL 40, October 1977.

Alternate Names

  • IMP-H/EnergeticElectronsandProtons


  • Space Physics: Magnetospheric Studies
  • Space Physics: Heliospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. H. Kent Hills



NameRoleOriginal AffiliationE-mail
Dr. James H. TrainorOther InvestigatorNASA Goddard Space Flight Center
Dr. Carl O. BostromOther InvestigatorApplied Physics Laboratory
Dr. Donald J. WilliamsPrincipal InvestigatorApplied Physics
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