NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Extreme Ultraviolet Spectrometer

NSSDC ID: 1973-085A-05
Mission Name: Mariner 10
Principal Investigator: Dr. A. Lyle Broadfoot

Description

The extreme ultraviolet spectrometer consisted of two instruments: an occultation spectrometer that was body-fixed to the spacecraft and an airglow spectrometer that was mounted on the scan platform. When the sun was obscured by the limbs of the planet, the occultation spectrometer measured the extinction properties of the atmosphere. The occultation spectrometer had a plane grating which operated at grazing incidence. The fluxes were measured at 47.0, 74.0, 81.0, and 89.0 nm using channel electron multipliers. Pinholes defined the effective field of view of the instrument which was 0.15 degree full width at half maximum (FWHM). Isolated spectral bands at approximately 75 nm (FWHM) were also measured. The objective grating airglow spectrometer was flown to measure airglow radiation from Venus and Mercury in the spectral range from 20.0--170.0 nm. With a spectral resolution of 2.0 nm, the instrument measured radiation at the following wavelengths: 30.4, 43.0, 58.4, 74.0, 86.9, 104.8, 121.6, 130.4, 148.0, and 165.7 nm. In addition, to provide a check on the total incident extreme UV flux to the spectrometer, two zero-order channels were flown. The effective field of view of the instrument was 0.13 by 3.6 degree. Data also include the interplanetary region.

Facts in Brief

Mass: 5.5 kg
Power (avg): 4.3 W

Disciplines

  • Astronomy: Ultraviolet
  • Planetary Science: Atmospheres
  • Space Physics: Zodiacal Light/Interplanet Dust

Additional Information

Questions or comments about this experiment can be directed to: Dr. David R. Williams.

 

Personnel

NameRoleOriginal AffiliationE-mail
Dr. A. Lyle BroadfootGeneral ContactUniversity of Southern Californiabroadfoot@vega.lpl.arizona.edu
Dr. Michael B. McElroyCo-InvestigatorHarvard Universitymbm@io.harvard.edu
Dr. Michael J.S. BeltonCo-InvestigatorKitt Peak National Observatorybelton@jupiter.noao.edu

Selected References

Broadfoot, A. L., et al., Ultraviolet observations of Venus from Mariner 10: Preliminary results, Science, 183, No. 4131, 1315-1318, Mar. 1974.

Broadfoot, A. L., et al., Mercury's atmosphere from Mariner 10: Preliminary results, Science, 185, No. 4146, 166-169, July 1974.

Broadfoot, A. L., et al., Mariner 10 ultraviolet spectrometer: Airglow experiment, Space Sci. Instrum., 3, No. 2, 199-208, May 1977.

Broadfoot, A. L., et al., Mariner 10 ultraviolet spectrometer: Occultation experiment, Space Sci. Instrum., 3, No. 2, 209-218, May 1977.

Image of the Extreme Ultraviolet Spectrometer experiment

Extreme Ultraviolet Spectrometer

[USA.gov] NASA Logo - nasa.gov