Physics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975georl...2..357k&link_type=abstract
Geophysical Research Letters, vol. 2, Aug. 1975, p. 357-360. NSF-supported research;
Physics
9
Airglow, Helium, Planetary Radiation, Resonance Scattering, Ultraviolet Spectra, Venus Atmosphere, Luminous Intensity, Mariner Venus-Mercury 1973, Planetary Crusts, Planetary Ionospheres, Radiation Effects, Solar Radiation
Scientific paper
Observations were made across the bright limb of Venus by the ultraviolet spectrometer on Mariner 10 as the spacecraft flew by this planet on February 5, 1974. The altitude variation of the brightness of 584-A emission is interpreted with respect to the helium distribution in the atmosphere. Resonance scattering of solar radiation is considered as the source of this emission. The comparison of model calculations with the data shows that the observed altitude profile is consistent with a He density of about 2 million/cu cm at 145-km altitude and with an exospheric temperature of the order of 375 K. If the major loss of helium is by solar-wind scavenging only, the present helium content on Venus can be maintained by an outgassing rate of about 200,000 per sq cm per sec from the planet crust. By using these neutral helium measurements, it is found that the He(+) ion density in the outer ionosphere would be of the order of 200/cu cm.
Broadfoot Lyle A.
Kumar Sanjeev
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