Evidence for the acceleration of ionospheric O/+/ in the magnetosheath of Venus

Details Evidence for the acceleration of ionospheric O/+/ in the magnetosheath of Venus Evidence for the acceleration of ionospheric O/+/ in the magnetosheath of Venus

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1277m&link_type=abstract

Geophysical Research Letters, vol. 8, Dec. 1981, p. 1277-1280.

Physics

47

Ionospheric Ion Density, Magnetosheath, Oxygen Ions, Particle Acceleration, Planetary Ionospheres, Planetary Magnetospheres, Plasma Sheaths, Space Plasmas, Venus Atmosphere, Energetic Particles, Ion Motion, Ion Sheaths, Ionospheric Composition, Pioneer Venus 1 Spacecraft, Plasma Spectra, Venus, Magnetosheath, Ionosphere, Oxygen, Acceleration, Ions, Flux, Pioneer Venus Orbiter, Pvo, Plasmas, Energy, Velocity, Altitude, Observations, Protons, Flows, Convection, Wakes, Data, Spectrum

Scientific paper

Plasma spectra from 12 orbits of the Pioneer-Venus Orbiter are reported which suggest the presence of ionospheric material in the magnetosheath plasma near and sunward of the terminator plane. Each spectrum shows a high E/q peak, consistent with O(+) moving at a speed lower than or comparable to that of the ambient magnetosheath plasma. It is pointed out that even though the data set is limited, the most intense heavy-ion fluxes clearly occur at altitudes less than a few thousand km. With the identification of the energetic component at O(+), the data reveal a trend for the speed of O(+) near the planet to be lower than the local magnetosheath speed, whereas the two speeds are comparable at altitudes above a few thousand km. These data, in combination with related observations that indicate O(+) moving at ambient speed in the distant wake, suggest that ionospheric material is swept up by the magnetosheath, accelerated to ambient speed within a few thousand km, and carried back through the wake region.

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