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VLF Signal Strength vs Frequency on 16-mm Cine Film


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1964-09-07 to 1965-12-29


This data set consists of graphical representations of VLF signal strength vs frequency, arranged chronologically on 46 reels of 16-mm motion picture film. These data have been through considerable processing in order to provide convenient reference to orbit and other selected geophysical information that may be useful. Each data frame consists of two parts. On the left side are three graphs, each pertaining to a particular receiver and covering one of the ranges from 0.2 to 1.6, 1.6 to 12.5, or 12.5 to 100 kHz. The graphs show frequency vs magnetic field intensity in decibels (referenced to 1 nT rms). For fixed-frequency operation, frequency is replaced by a time scale. The right half of each frame pictorially shows the satellite position in orbit looking both perpendicular to and parallel to the equatorial plane. Time, illumination, L, k, and other digital data for the time and/or position of observation are included on the frame in digital form. Data available include all observations taken prior to December 1965. Subsequent observations have not been processed and/or released by the experimenter. The data set includes both real time data and observations tape recorded on the spacecraft. Additional information and illustrations of these data are in W. E. Blair and B. P. Ficklin, "Summary of Digital Data Processing Systems for the OGO SU/SRI Very-Low-Frequency Experiments," Summary Report, Stanford Research Institute, Stanford, CA, July 1967 (NSSDC TRF B01263).

Alternate Names

  • VLF Signal Strength vs Freq(Cine)


  • Space Physics: Ionospheric Studies


  • 64-054A-08C

Additional Information



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



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