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Electron Differential Energy Spectrometer

NSSDCA ID: 1961-015B-03

Mission Name: Injun 1
Principal Investigator:Mr. C. D. Laughlin


This experiment was designed to study auroral and radiation zone phenomena using three end-window type 213 directional Geiger-Mueller (GM) counters. Small magnets were used to focus electrons with energies between 40 and 50 keV into one of the GM counters and electrons with energies between 90 and 100 keV into another counter. The third GM counter served as a monitor of penetrating X rays and energetic protons. The detector accumulators were sampled once per second, and the accumulation time for each detector was 61/64 s. (The spacecraft had a complex spin-and-tumble motion with an ill-defined and variable period of several minutes). The experiment performed nominally throughout the lifetime of the spacecraft.

Alternate Names

  • Geiger-Muller Tube and Electron Spectrometer
  • Injun1/ElectronDifferentialEnergySpectrometer

Facts in Brief

Mass: 0.86 kg
Power (avg): 0.1 W
Bit rate (avg): 0.256 kbps

Funding Agency

  • Department of Defense-Department of the Navy (United States)


  • Space Physics: Magnetospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Mr. C. D. LaughlinPrincipal InvestigatorMcDonald Observatory
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