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24-Hour Color Energy-Time Spectrograms, Digital Images in GIF Format


Availability: At NSSDC, Ready for Electronic Access

Time span: 1973-11-15 to 1996-08-13


This data set consists of GIF images of experimenter-supplied, full-color, E-t (energy-time) spectrograms for plasma measurements with the LEPEDEA on board IMP 8, taken during IMP's magnetotail orbit phases. As is more fully described in JGR, 81, 5859, the spectrograms display the detector responses to proton intensities as functions of energy (ordinate) and time (abscissa) for four directions, or sectors, of the instrument fields of view. These detector responses are color coded. A spectrogram also summarizes the angular distributions of proton intensities as functions of the directions of the field of view. Two panels show the responses of the electron channels. These show the angular distributions of electrons of electron intensities vs time, and the energy spectrum of the electrons vs time, averaged over the field of view. Each slide covers an entire day. These spectrograms were obtained for the archive from the PI site at

These spectrograms are also available on 35-mm color slides in NSSDC data set SPMS-00043 (or old NSSDC ID 73-078A-04C).

Alternate Names

  • Color E-T Spectrograms GIF Images


  • Space Physics: Magnetospheric Studies


  • 73-078A-04E

Additional Information



Questions and comments about this data collection can be directed to: Dr. H. Kent Hills



NameRoleOriginal AffiliationE-mail
Ms. Rae DvorskyData ProviderUniversity of

Selected References

  • Frank, L. A., Initial observations of low-energy electrons in the earth's magnetosphere with OGO 3, J. Geophys. Res., 72, 185-195, doi:10.1029/JZ072i001p00185, Jan. 1967.
  • Frank, L. A., et al., On hot tenuous plasmas, fireballs, and boundary layers in the earth's magnetotail, J. Geophys. Res., 81, No. 34, 5859-5881, doi:10.1029/JA081i034p05859, Dec. 1976.
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