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X-Ray Experiment

NSSDCA ID: 1959-007A-02

Mission Name: Vanguard 3
Principal Investigator:Dr. Herbert D. Friedman


The objective of this experiment was to measure the X-ray emission from the sun and its effects on the Earth's atmosphere. The detectors were two identical ionization chambers sensitive to X-ray wavelengths produced in solar flares (2 to 8 A). The ionization chambers were located 120 deg apart in the equatorial plane of the satellite and received a maximum signal when an ion chamber tube "looked" toward the sun. The instrumentation measured the 2- to 8-A X-ray flux, and recorded the peak solar flare intensity by means of a peak-reading memory device, during the daylight portion of each orbit. No useful data were returned from this experiment because high-energy electrons in the Van Allen radiation belt swamped the ionization chambers.

Alternate Names

  • Vanguard3/X-RayExperiment


  • Solar Physics: X-Ray

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Herbert D. FriedmanPrincipal InvestigatorUS Naval Research Laboratory
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