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Energetic Particles Detectors

NSSDCA ID: 1962-049A-02

Mission Name: Alouette 1
Principal Investigator:Dr. Ian B. McDiarmid


This experiment consisted of six detectors whose objectives were to determine the intensity structure of the lower portion of the outer Van Allen radiation belt at high latitudes and measure intensity changes associated with solar and geophysical phenomena, particularly auroras. The first, an Anton 302 Geiger counter, was in a shielded part of the package and was used only for omnidirectional measurements of protons and electrons with energies greater than 33 and 2.8 MeV, respectively. An Anton 223 Geiger counter, which pointed 10 deg off the spacecraft spin axis, responded directionally to electrons and protons with energies greater than 40 and 500 keV, respectively. A second Anton 223 Geiger counter, pointed parallel to the spacecraft spin axis and coupled to a magnetic broom, responded directionally to electrons and protons with energies greater than 250 and 500 keV. Omnidirectionally, both Geiger counters responded to electrons and protons with energies greater than 2.8 and 33 MeV, respectively. The fourth detector, a silicon junction, was collimated to look 10 deg off the spin axis. Directionally, it responded to protons and alpha particles in the energy ranges 1.3 to 7 and 4.3 to 28 MeV, respectively. Omnidirectionally, the silicon junction responded to protons in the energy range 55 to 60 MeV. The last two detectors, a Geiger telescope consisting of two trays of Philips 18509 Geiger counters and a plastic scintillator located between the two Geiger counter trays of the telescope, were pointed perpendicular to the spacecraft spin axis. These detectors had only directional responses to protons and alpha particles with energies greater than 100 and 400 MeV, respectively. This experiment performed well initially and was turned off on January 29, 1968, though still performing normally. No alpha particle data were obtained from this experiment.

Alternate Names

  • Alouette1/EnergeticParticlesDetectors


  • 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
Dr. Ian B. McDiarmidPrincipal InvestigatorNational Research Council of Canada
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