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Study of Cosmic-Ray, Solar, and Magnetospheric Electrons

NSSDCA ID: 1972-073A-13

Mission Name: IMP-H
Principal Investigator:Dr. Thomas L. Cline


This experiment studied galactic and solar electrons and positrons in the kinetic energy range 50 keV to 2 MeV. Information on protons between 0.5 and 4.0 MeV was also obtained. A collimated stilbene crystal scintillator looking perpendicular to the spacecraft spin axis served as the principal detector. A similar fully shielded crystal served to determine the contribution to the principal detector count rate of electrons and protons generated within the principal detector by gamma rays and neutrons, respectively. A fully shielded CsI crystal served as a gamma-ray spectrometer and was used in coincidence with the principal detector to distinguish electrons from positrons. Count rates from each detector obtained in eight angular sectors per revolution were telemetered. In addition, the amplitude and shape of the pulse generated in the principal detector by the first stopping particle in each appropriate telemetry frame was studied. Pulse amplitude and shape yielded energy (10% resolution) and particle species information.

Alternate Names

  • IMP-H/StudyofCosmic-Ray,Solar,andMagnetosphericElectrons
  • Study of Cosmic Ray, Solar, and Magnetospheric Electrons

Funding Agency

  • Unknown (United States)


  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Thomas L. ClinePrincipal InvestigatorNASA Goddard Space Flight
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