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Published Data on 1216- and 1304-A Limb and Disc Areas of Mars on Microfiche


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

Time span: 1971-11-12 to 1971-12-06


This data set consists of two published reports supplied by the experimenter - "Mariner 9 Mars Orbiter Ultraviolet Spectrometer Experiment Data Report 8, March 8, 1972", and "Mariner 9 Mars Orbiter Ultraviolet Spectrometer Experiment Data Report 10, March 15, 1972." These reports were published in hardcopy by the Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado. Report 8 provides OI 1304-A data from both the bright limb and disc of Mars. The 1304-A data have been previously reported in Data Reports 1 and 3 (71-051A-02B). Presented in Report 8 are data for November 12, 1971, and for November 27 to December 4 and 6, 1971. Each pass shown represents approximately 30 min of viewing time as the FOV crossed the bright limb, moved onto the disc, and continued past the evening terminator. The data are divided into two parts - preorbital and orbital. Figures 1 and 2 deal with the preorbital data. Figure 1 shows first-order spectrum between 1270 and 1370 A obtained by averaging 511 successive spectra of the disc of Mars viewed from approximately 300,000 km. The relative intensity of OI 1304 and OI 1356 are depicted on an intensity vs wavelength plot with a disc in the upper right hand corner showing the illumination of the disc and the FOV. Figure 2 shows theoretical intensity contours of these features for the same viewing conditions. Figures 3 to 11 deal with the orbital data. Each figure is composed of two parts. The upper half shows the orbital parameters (cosine of angle at intersection point between look direction and local zenith, cosine of solar zenith angle, and scattering angle) needed to specify the line of sight and solar zenith angle along that line. The lower half of each figure shows the 1304-A intensity, a theoretical 1304-A intensity, and the CO (a-x) intensity on a relative scale. Also indicated is the approximate time the FOV moved from the limb onto the disc. Report 10 provides HI 1216-A Lyman-alpha data from both the bright limb and disc of Mars. The data format is identical to that of Report 8, except that there are no preorbital data, theoretical 1216-A intensity, and CO (a-x) plots included. This report covers the same period as Report 8.

Alternate Names

  • 1216, 1304 A Limb/Disc Data,Fiche
  • 1216 and 1304 A Limb/Disc Data


  • Planetary Science: Atmospheres
  • Planetary Science: Biology
  • Planetary Science: Geology and Geophysics


  • 71-051A-02C

Additional Information



Questions and comments about this data collection can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Dr. Charles A. BarthData ProviderUniversity of
Dr. Charles A. BarthGeneral ContactUniversity of
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