Computer Science – Sound
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..199b&link_type=abstract
Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 199-211.
Computer Science
Sound
72
Ionospheric Electron Density, Ionospheric Temperature, Night Sky, Planetary Ionospheres, Venus Atmosphere, Holes, Ionospheric Sounding, Magnetic Measurement, Pioneer Venus Spacecraft, Pioneer Venus 1 Spacecraft, Planetary Magnetic Fields, Plasma Diagnostics, Plasma Pressure, Thermal Properties, Magnetotail, Hypotheses, Venus, Ionosphere, Diagrams, Pioneer Venus Orbiter, Nightside, Electrons, Density, Temperatures, Pvo, Electron Temperature Probe, Characteristics, Morphology, Altitude, Shape, Magnetic Fields
Scientific paper
Measurements of electron density and temperature by the Pioneer Venus orbiter electron temperature probe have been employed to examine the characteristics and morphology of ionospheric holes in the antisolar ionosphere of Venus. The holes apparently exist as north-south pairs which penetrate the ionosphere vertically down to altitudes as low as 160 km. Magnetic field measurements show that the holes are permeated by strong radial fields whose pressure is sufficient to balance the plasma pressure of the surrounding ionosphere. The electron temperature in the holes is substantially cooler than the surrounding ionosphere, except in the lowest density regions of the holes where the temperatures greatly exceed the ionosphere temperature. The low temperatures and the low densities of the holes are consistent with the strong radial magnetic fields which inhibit horizontal transport of plasma and thermal energy from the surrounding ionosphere. Plasma depletion processes associated with magnetotail electric fields may be important in the formation of the holes.
Brace Larry H.
Curtis Steven Andrew
Luhmann Janet G.
Mayr Hans G.
Theis Robert F.
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