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Ions and Electrons in the Energy Range 0.1 to 2 MeV

NSSDCA ID: 1972-073A-03

Mission Name: IMP-H
Principal Investigator:Prof. George Gloeckler


This experiment was designed to determine the composition and energy spectra of low-energy particles associated with solar activity and interplanetary processes. The detectors used were (1) an electrostatic analyzer (to select particles of the designated energy per charge) combined with an array of windowless solid-state detectors (to measure the energy loss) and surrounded by an anticoincidence shielding, and (2) a particle telescope consisting of a silicon surface-barrier detector and a flat two-chamber proportional counter enclosed in an anticoincidence scintillator cup. The experiment measured particle energies from 0.1 to 2 MeV per charge in 12 bands and uniquely identified positrons and electrons as well as nuclei with charges of Z from 1 to 8 (and charge group resolution for Z between 9 and 28). Two 1000-channel pulse-height analyzers, one for each element of the telescope, were included in the experiment payload. The telescope failed on November 25, 1972, when the window on the proportional counter weakened and burst due to exposure to UV radiation.

Alternate Names

  • IMP-H/IonsandElectronsintheEnergyRange0_1to2MeV


  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Dieter K. HovestadtOther InvestigatorMax-Planck-Institut fur Extraterrestrische Physik
Dr. Charles Y. FanOther InvestigatorUniversity of Arizona
Prof. George GloecklerPrincipal InvestigatorUniversity of
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