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Solid State Detector

NSSDCA ID: 1965-058A-06

Mission Name: Vela 3A
Principal Investigator:Dr. Sidney Singer


The purpose of this experiment was to study the intensity, spatial distribution, time variations, and energy spectra of the electrons in the transition region and in the tail of the earth's magnetosphere. The sensor consisted of a gold, surface-barrier semiconductor detector. This detector was shielded from sunlight by two layers of nickel foil. The energy loss in these foils by electrons with energy greater than about 40 keV was almost negligible. The instrument responded to electrons between 30 and 475 keV and protons between 180 and 570 keV. The energy spectrum was measured in steps by successive stepping of a pulse-height analyzer giving eight points on the integral energy spectrum. Electrons and protons could be distinguished by comparison of this detector and the Geiger-Mueller experiment (NSSDC 65-058A-07) count rates. This experiment worked well over the period of major data coverage of the satellite.

Alternate Names

  • Vela3A/SolidStateDetector


  • 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. Sidney SingerPrincipal InvestigatorLos Alamos National
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