Global observations of the composition and dynamics of the ionosphere of Venus - Implications for the solar wind interaction

Details Global observations of the composition and dynamics of the ionosphere of Venus - Implications for the solar wind interaction Global observations of the composition and dynamics of the ionosphere of Venus - Implications for the solar wind interaction

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.7765t&link_type=abstract

Journal of Geophysical Research, vol. 85, Dec. 30, 1980, p. 7765-7777.

Physics

30

Venus, Ionosphere, Composition, Dynamics, Solar Wind, Pvo Mission, Ions, Spacecraft Observations, Oims Instrument, Plasma, Bow Shock, Ionosheath, Ionopause, Dayside, Nightside, Distribution, Concentration, Altitude, Diagrams, Magnetic Fields, Chemistry, Calculations, Diurnal Variations

Scientific paper

The in-situ measurements of the global composition and Venus ionosphere dynamics recorded by the Bennett ion mass spectrometer on the Pioneer Venus orbiter during Dec. 1978-Aug. 1979 are presented. The observations of three plasma regimes show the bowshock-ionosheath region, the thermal ionosphere, and a superthermal flowing ion layer contacting the ionosphere at the ionopause and extending outward to different heights above the planet. An abundant ionosphere dominated by O(+) above 200 km and by O2(+) down to the typical periapsis altitudes of 160 km occur during quiet periods; less disturbed data shows strong day to night changes in the distributions of ions including O(+), O2(+), CO2(+), and N(+). The ionopause is located near the subpolar point at 250-400 km; under disturbed nighttime conditions it may have randomly spaced concentration gradients in the dusk region.

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