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NASA Space Science Data Coordinated Archive Header

Reduced Data, ASCII


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

Time span: 1974-12-11 to 1985-02-18


This data set (74-097A-11C) is an ASCII version, converted by NSSDC from the originally-submitted data set "Reduced Data Tape" (74-097A-11A). The original data were written in binary by a PDP/10, on multifile tapes, with each tape containing one month of data.

These reduced data are not corrected for star light or plasma-scattered light. There is a further-processed data set where these corrections have been made. That data set is "Zodiacal Light Data, ASCII" (74-097A-11D), which is an ASCII version of the further-processed original binary data set "Zodiacal Light Data" (74-097A-11B).

The first file in each month is a month (tape) header file; the file contains, also, in sequence all the measurement cycle header blocks. These blocks provide information about the status/health of the instruments, calibration, etc., for all the science data blocks in the month (tape). This month (tape) header file is followed by a series of individual files, each providing science data. The file structure is as follows: The first block is a measurement cycle header. (It is a repeat of the item in the month (tape) header file.) The second block provides housekeeping information, mainly the average temperatures of the sensors. The third block provides the reduced science data: Stokes parameters (Q) in ultraviolet, blue, and visible lights (U,B,V), polarization angles, Stokes parameters (U), polarized intensities, total intensities, degree of polarization, again in the U, B, and V bands. The final, fourth block provides a number of coordinate values and velocity components of the spacecraft and some planets, angles such as earth-Helios-sun angle, aspect angles of some planets, etc.

Alternate Names


    • Space Physics: Zodiacal Light/Interplanet Dust
    • Planetary Science: Small Bodies
    • Astronomy: Visible


    • 74-097A-11C

    Additional Information



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



    NameRoleOriginal AffiliationE-mail
    Dr. Christoph LeinertData ProviderMax-Planck-Institut fur

    Selected References

    • Planck, B., Description of the reduced-data-tape of the Helios zodiacal light experiment E9, Max-Planck-Inst. fur Aeronomie, Heidelbergkonigstuhl, Fed. Rep. of Germany, Aug. 1980.
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