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Voyager Raw Radio Science Data from Titan (PDS)


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

Time span: 1980-11-12 to 1980-11-12


This data set contains raw data, partially processed data, and ancillary/supporting files acquired during the Voyager 1 radio occultation by Titan. It has been prepared following standards of the NASA Planetary Data System (PDS).

Observations were carried out using the Voyager 1 spacecraft and Earth-based receiving stations of the NASA Deep Space Network (DSN). The observations were designed so that physical structure of Titan's atmosphere (including surface temperature and pressure) could be determined. The data also allowed estimation of Titan's radius and marginal detection of an ionosphere.

The spacecraft S- and X-band carrier signals (at approximately 13 and 3.5 cm wavelengths, respectively) served as coherent signal sources, probing the atmosphere at various depths. Output from the DSN receivers was sampled and recorded for later analysis. Only right-circularly polarized (RCP) signals were recorded during the Titan observations. Two sets of recording equipment (denoted Recorder A and Recorder B) were used, running in parallel with staggered start/stop times. The original data tapes -- high-speed analog (video) tapes onto which digital data were recorded -- were converted to conventional 9-track computer-compatible tapes (CCTs) later. The data from these CCTs (with names of the form VJnnnn) represent the primary archival product here.

Each disc in the volume set contains data from part of the Titan occultation period. Data from successive discs are in chronological order, except that data from the two recorders are not mixed on a single CD. A table of contents is included with each volume, listing each data file in the volume. A separate table of contents shows all files within the data set.

The last two volumes contain data collected after the Titan experiments and may be useful in characterizing (calibrating) the data acquisition system. The Voyager Radio Science Team preferred consistency checks within the Titan data and did not use the calibration tapes extensively.

Raw data from the Voyager 1 Saturn egress occultation were recorded using the same systems one day after the Titan encounter. They have been archived separately.

Ancillary Data Information

Alternate Names

  • PDS Voyager Raw Data from Titan
  • VG1-SSA-RSS-1-ROCC-V1.0


  • Planetary Science: Atmospheres


  • 77-084A-02N

Additional Information



Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II



NameRoleOriginal AffiliationE-mail
Dr. Richard A. SimpsonGeneral ContactStanford
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