Observed composition of the ionosphere of Venus - Implications for the ionization peak and the maintenance of the nightside ionosphere

Details Observed composition of the ionosphere of Venus - Implications for the ionization peak and the maintenance of the nightside ionosphere Observed composition of the ionosphere of Venus - Implications for the ionization peak and the maintenance of the nightside ionosphere

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..283t&link_type=abstract

(International Conference on the Venus Environment, Palo Alto, CA, Nov. 1-6, 1981.) Icarus, vol. 51, Aug. 1982, p. 283-295.

Computer Science

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20

Atmospheric Ionization, Ionospheric Composition, Night Sky, Planetary Ionospheres, Venus Atmosphere, Ionospheric Ion Density, Nitric Oxide, Oxygen Ions, Pioneer Venus Spacecraft, Positive Ions, Satellite Sounding, Vertical Distribution

Scientific paper

Across the nightside of Venus, daily measurements from the PV Orbiter Ion Mass Spectrometer often indicate an ionosphere of relatively abundant concentration, with a composition characteristic of the dayside ionosphere. Such conditions are interspersed by other days on which the ionosphere appears to largely 'disappear' down to about 200 km, with ion concentrations at lower heights also much reduced. These characteristics, coupled with observations of strong day to night flows of O(+) in the upper ionosphere, support arguments that ion transport from the dayside is important for the maintenance of the nightside ionosphere. In the range 140-160 km, strong concentrations of O2(+) and NO(+) indicate that the ionization peak is at times composed of at least two prominent ion species. Nightside concentrations of O2(+) and NO(+) as large as 100,000 and 10,000/cu cm, respectively, appear to require sources in addition to that provided by transport. The most probable sources are considered briefly, and no satisfactory explanation is yet found for the observed NO(+) concentrations.

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