The Venus ionosphere at grazing incidence of solar radiation - Transport of plasma to the night ionosphere

Details The Venus ionosphere at grazing incidence of solar radiation - Transport of plasma to the night ionosphere The Venus ionosphere at grazing incidence of solar radiation - Transport of plasma to the night ionosphere

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..261w&link_type=abstract

(International Conference on the Venus Environment, Palo Alto, CA, Nov. 1-6, 1981.) Icarus, vol. 51, Aug. 1982, p. 261-270.

Computer Science

26

Ionospheric Propagation, Night Sky, Planetary Ionospheres, Plasma Dynamics, Space Plasmas, Venus Atmosphere, Grazing Incidence, Ion Motion, Ionospheric Ion Density, Molecular Ions, Pioneer Venus 1 Spacecraft, Positive Ions, Solar Corpuscular Radiation, Two Dimensional Models, Zenith

Scientific paper

A quasi-two-dimensional model of the Venusian ionosphere is used to calculate the ion number densities and horizontal ion bulk velocities expected for a range of solar zenith angles near the terminator (80-100 deg). These results are compared with data from the Pioneer Venus Orbiter retarding potential analyzer. It is shown that antisunward horizontal plasma fluxes produced by solar EUV-induced pressure gradients are sufficient to maintain the nighttime ionosphere. While photoionization is the dominant source of ionospheric plasma for solar zenith angles less than 92 deg, plasma transport from the dayside is the dominant plasma source for solar zenith angles greater than 95 deg. It is also shown that the main nightside plasma peak at a height of 140 km is of the F2 type; its height and shape are therefore quite insensitive to the height of the ion source.

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