Electron observations and ion flows from the Pioneer Venus Orbiter plasma analyzer experiment

Details Electron observations and ion flows from the Pioneer Venus Orbiter plasma analyzer experiment Electron observations and ion flows from the Pioneer Venus Orbiter plasma analyzer experiment

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...205..116i&link_type=abstract

Science, vol. 205, July 6, 1979, p. 116-119. Research supported by the University of Southern California;

Physics

6

Electron Plasma, Ion Sheaths, Pioneer Venus 2 Spacecraft, Planetary Ionospheres, Solar Wind Velocity, Venus Atmosphere, Electron Energy, Energy Spectra, Gas Ionization, Graphs (Charts), Pioneer Venus 1 Spacecraft, Plasma Sheaths, Solar Protons, Electrons, Observations, Ions, Flow, Pioneer Venus, Plasmas, Venus, Experiments, Solar Wind, Nightside, Ionosphere, Orbiter Plasma Analyzer

Scientific paper

Additional plasma measurements in the vicinity of Venus are presented. It is shown that (1) there are three distinct plasma electron populations - solar wind electrons, ionosheath electrons, and nightside ionosphere electrons; (2) the plasma ion flow pattern in the ionosheath is consistent with deflected flow around a blunt obstacle; (3) the plasma ion flow velocities near the downstream wake may, at times, be consistent with the deflection of plasma into the tail, closing the solar wind cavity downstream from Venus at a relatively close distance (within 5 Venus radii) to the planet; (4) there is a separation between the inner boundary of the downstream ionosheath and the upper boundary of the nightside ionosphere; and (5) during the first 4.5 months in orbit the measured solar wind plasma speed continued to vary, showing a number of high-speed, but generally nonrecurrent, streams.

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