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Ground Magnetic Field Line Intercept Plots on Microfiche


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

Time span: 1977-10-24 to 1987-09-14


This data set, prepared by the magnetometer investigator group, consists of microfiche plots that show on a world map the predicted northern and southern hemisphere ground intercepts ("footprints") of the magnetic field line passing through the satellite position. The intercepts were calculated by using the Olson-Pfitzer model (W. P. Olson and K. A. Pfitzer, "Magnetospheric Magnetic Field Modeling," McDonnell-Douglas Astronautics Company preprint, 1977), which includes both internal and external field contributions. This model is appropriate for quiet magnetic conditions and is limited to field lines that cross the equator earthward of 15 earth radii. Two microfiche frames are used to cover each world map, which is displayed in Mercator projection. Each map shows the field line intercepts for two orbits, which are identified by number. Start and stop times of each segment are printed on the map, and tick marks are located at 1-h intervals along the segments.

Alternate Names

  • Gnd Mag Fld Line Intercept Plots


  • Ancillary: Ephemeris/Orbit/Attitude


  • 77-102A-00I

Additional Information


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



NameRoleOriginal AffiliationE-mail
Dr. Mark A. SaundersGeneral ContactUniversity of California, Los Angeles
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