Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..345b&link_type=abstract
Geophysical Research Letters, vol. 6, May 1979, p. 345-348.
Physics
3
Night Sky, Planetary Ionospheres, Venus Atmosphere, Graphs (Charts), Ionospheric Electron Density, Ionospheric Ion Density, Pioneer Venus 1 Spacecraft, Venus, Nightside, Ionosphere, Configurations, Pioneer Venus, Observations, Electrons, Ions, Concentrations, Terminators, Asymmetry, Shock, Surface
Scientific paper
Nightside measurements of electron and ion concentrations by instruments on the Pioneer Venus Orbiter have revealed an ionopause which is highly dynamic and whose global configuration is surprisingly complex. Inbound crossing which occur at high northern latitudes encounter the ionopause at an average altitude of 870 km in the late afternoon sector. The average ionopause altitude increases slightly near 100 deg solar zenith angle (SZA) followed by a nightside compression to well below 500 km. The outbound crossings of the ionopause occur at about 20 deg south of the equator. The ionospause at this latitude is found at an average altitude of 800 km in the afternoon-evening sector between 65 and 110 deg SZA, followed by a pronounced rise to altitudes as high as 3000 km in a pronounced bulge near 130 deg SZA.
Brace Larry H.
Cloutier Paul A.
Daniel R. E.
Nagy Andrew F.
Taylor Harry A.
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