Computer Science
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..271c&link_type=abstract
(International Conference on the Venus Environment, Palo Alto, CA, Nov. 1-6, 1981.) Icarus, vol. 51, Aug. 1982, p. 271-282.
Computer Science
47
Ionospheric Composition, Night, Periodic Variations, Planetary Ionospheres, Plasma Density, Solar Activity Effects, Venus Atmosphere, Mass Spectrometers, Pioneer Venus Spacecraft, Pioneer Venus 1 Spacecraft, Solar Wind, Wind Pressure
Scientific paper
Instruments on the Pioneer Venus Orbiter have detected a substantial ionosphere on the nightside of Venus during most orbits. However, during some orbits the nightside ionosphere seems to have almost disappeared, existing only as irregular patches of low-density plasma. The solar wind dynamic pressure on these occasions is greater than average. Data from several instruments (Langmuir probe, ion mass spectrometer, retarding potential analyzer, magnetometer, and plasma analyzer) have been correlated for a number of orbits during which the nightside ionosphere had disappeared. The magnetic field tends to be coherent, horizontal, and larger than usual, and the electron and ion temperatures are much larger than they usually are on the nightside. Mechanisms are suggested which might explain the reasons for the disappearance of the ionosphere when the solar wind dynamic pressure is large.
Barnes Alan
Brace Larry H.
Cravens Thomas E.
Knudsen W. L.
Mihalov John D.
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