Physics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7282b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7282-7296.
Physics
48
Electrostatic Probes, Lyman Alpha Radiation, Photoelectron Spectroscopy, Solar Flux, Ultraviolet Radiation, Venus Atmosphere, Pioneer Venus Spacecraft, Planetary Ionospheres, Solar Cycles, Solar Rotation
Scientific paper
The photoelectron current from the Pioneer Venus Langmuir probe has provided measurements of the solar extreme ultraviolet flux at Venus since 1979. This current is the product of the photoelectric yield of the collector and the solar spectrum at wavelengths short enough to cause emission. Calculations show that approximately 51% of the emission is due to Lyman α (1216 Å), 46% is produced by wavelengths between 550 and 1100 Å, and less than 3% is due to wavelengths longer than Lyman α. Thus the Langmuir probe provides a direct measure of the total solar EUV flux, including most of the wavelengths that produce the Venus ionosphere and heat and excite neutrals in the thermosphere. The measurement technique is described, and the daily average measurements of photocurrent obtained between 1979 and 1987 are presented.
Brace Larry H.
Hoegy Walter R.
Theis Robert F.
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