title: Ultraviolet observations of venus from mariner 10: preliminary results.
abstract: An objective grating spectrometer on Mariner 10 has measured air-glow in the wavelength range 200 to 1700 angstroms. The data reveal the presence of significant concentrations of hydrogen, helium, carbon, and oxygen atoms in the upper atmosphere of Venus. A preliminary analysis of the hydrogen data indicates an exospheric temperature of 400 degrees K. There is evidence for intense air-glow emission at wavelengths longward of 1350 angstroms; the nature of this emission is unclear, but the radiation is spatially extensive and detectable on both day and night sides of the planet.
authors.forename: A L
authors.initials: AL
authors.lastname: Broadfoot
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.forename: M J
authors.initials: MJ
authors.lastname: Belton
authors.forename: M B
authors.initials: MB
authors.lastname: McElroy