Interannual and short-term variations of the Venus nighttime hydrogen bulge

Details Interannual and short-term variations of the Venus nighttime hydrogen bulge Interannual and short-term variations of the Venus nighttime hydrogen bulge

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8910669t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 1, 1984, p. 10669-10675.

Physics

13

Atmospheric Composition, Diurnal Variations, Hydrogen, Venus Atmosphere, Ion Distribution, Solar Flux, Time Series Analysis

Scientific paper

The predawn bulge in the diurnal distribution of neutral hydrogen at Venus is found to persist over the first three Venus years of the Pioneer Venus mission. Concentrations of H, derived from in situ mass spectrometer measurements of O+, H+, O, and CO2 show a diurnal bulge with peak levels near 2 - 5×107/cm3 and a night to day concentration ratio of about 200/1. The presence of short-term fluctuations of as much as a factor of three from day to day reflects the variability in the ion and neutral concentrations often detected on the nightside. Allowing for this superimposed variability, relatively little difference in the magnitude of n(H) between 1979 and 1980 is indicated. The influence of solar EUV and solar wind are discussed.

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