Evidence for day-to-night ion transport at low solar activity in the Venus pre-dawn ionosphere

Details Evidence for day-to-night ion transport at low solar activity in the Venus pre-dawn ionosphere Evidence for day-to-night ion transport at low solar activity in the Venus pre-dawn ionosphere

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2739b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 23, p. 2739-2742

Physics

12

Pioneer Venus Spacecraft, Planetary Ionospheres, Plasmas (Physics), Solar Activity, Solar Planetary Interactions, Transport Properties, Venus Atmosphere, Atmospheric Entry, Electron Precipitation, Ion Density (Concentration), Mass Spectrometers, Mathematical Models, Night

Scientific paper

Periapsis of the Pioneer Venus (PV) spacecraft dropped below 180 km on August 28, 1992 near midnight, and 42 orbits of low altitude data at moderately low solar activity in the pre-dawn sector were obtained before contact was lost to the spacecraft in October, 1992. Through a combination of analysis of data from the PV orbiter ion mass spectrometer (OIMS) and modeling, we consider here what can be learned about the relative importance of plasma transport from the dayside and electron precipitation in maintaining the nightside ionosphere during the re-entry period. In particular, we examine here the atomic ion density profiles. We compute the average peak density of O(+) as a function of solar zenith angle and determine what fluxes of atomic ions or precipitating electrons would be necessary to produce those values. We then compare model calculations of the ion densities to those observed during the re-entry period. We find that the low solar activity nightside ionosphere shows evidence of significant day-to-night plasma transport.

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