Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1766p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 1766-1772. NASA-supported research.
Physics
17
Venus, Spacecraft Observations, Pioneer Venus Mission, Orbiters, Analysis, Ultraviolet, Wavelengths, Spectrometry, Lyman-Alpha Radiation, Density, Hydrogen, Flux, Theoretical Studies, Distribution, Parameters, Models, Radiative Transfer, Calculations, Pvo Mission, Uvs Instrument
Scientific paper
Pioneer Venus Orbiter ultraviolet spectrometer data from 20 orbits which span 3 years have been analyzed to determine the atomic hydrogen number density and vertical flux at the exobase as a function of solar zenith angle, F(10.7) index, and spacecraft latitude. From 1979 through 1981, the exobase number density n(c) and flux phi(c) are remarkably constant at n(c) = 6.0 + or - 1.5 x 10 to the 4th/cu cm and phi(e) = 7.5 + or - 1.5 x 10 to the 7th/sq cm per s in the subsolar region. The integrated vertical column density above 110 km is 3.6 + or - 1 x 10 to the 13th/sq cm. An empirical relationship is determined between the line center solar flux at H Lyman alpha, piF(0), and the F(10.7) index.
Anderson David E.
Paxton Larry J.
Stewart Ian F. A.
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