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VLF WideBand Receiver (0-10kHz)

NSSDCA ID: 1962-067B-12

Mission Name: Injun 3
Principal Investigator:Prof. Donald A. Gurnett


This experiment was designed to study VLF noise phenomena at orbital altitudes. It was possible that noise sources included man-made signals from the ground or satellite, spherics, or other noises generated: in the ionosphere, by trapped charged particles, or from other extra terrestrial sources. The receiver system consisted of a 30.5-cm diameter loop antenna mounted above the spacecraft on a stubby support. The loop was in a plane parallel to the satellite equator and observed the magnetic component of the noise, since the spacecraft maintained an attitude such that the geomagnetic field lines were parallel to its equatorial plane. The antenna fed the 0 to 10 kHz signal into two receivers. One receiver was identified with experiment 62-067B-09, and the other receiver used the signal to modulate the telemetry transmitter. This modulated signal was converted to standard sonograms (frequency vs time graphs) of either high or low resolution, depending upon the type of spectrum analyzer used to process the telemetered data. This experiment is described in more detail in D. A. Gurnett and B. J. O'Brien, J. Geophys. Res., v. 69, n. 1, p. 65, 1964.

Alternate Names

  • Injun3/VLFWideBandReceiver_0-10kHz_


  • Space Physics: Ionospheric Studies
  • 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
Prof. Donald A. GurnettPrincipal InvestigatorUniversity of Iowa
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