Variations in ion and neutral composition at Venus - Evidence of solar control of the formation of the predawn bulges in H/+/ and He1

Details Variations in ion and neutral composition at Venus - Evidence of solar control of the formation of the predawn bulges in H/+/ and He1 Variations in ion and neutral composition at Venus - Evidence of solar control of the formation of the predawn bulges in H/+/ and He1

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...52..211t&link_type=abstract

(International Conference on the Venus Environment, Palo Alto, CA, Nov. 1-6, 1981.) Icarus, vol. 52, Nov. 1982, p. 211-220.

Computer Science

4

Diurnal Variations, Ion Density (Concentration), Neutral Particles, Solar Activity Effects, Venus Atmosphere, Extreme Ultraviolet Radiation, Helium, Hydrogen, Ionic Mobility, Light Ions, Photoionization, Solar Flux, Solar Heating

Scientific paper

A comparison of ion and neutral composition measurements at Venus for periods of greatly different solar activity provides qualitative evidence of solar control of the day-to-night transport of light ion and neutral species. Concentrations of H(+) and He in the predawn bulge near solar maximum in November, 1979, exhibit a depletion signature correlated with a pronounced modulation in the solar F10.7 and EUV fluxes. This perturbation, not observed in the predawn region during an earlier period of relative quiet solar conditions, is interpreted as resulting from pronounced changes in solar heating and photoionization on the dayside, which in turn modulate the transport of ions and neutrals into the bulge region.

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