Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...67..325s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 67, Aug. 1986, p. 325-335.
Physics
8
Atmospheric Models, Atmospheric Temperature, Planetary Ionospheres, Two Dimensional Models, Venus Atmosphere, Ion Temperature, Ionopause, Magnetohydrodynamic Flow, Pioneer Venus 1 Spacecraft, Space Plasmas, Vertical Motion
Scientific paper
A spectral model is defined for the electron and ion temperature profiles of the Venus ionosphere. The model is developed using data collected with the retarding potential analyzer on the Pioneer Venus Orbiter, and account is taken of horizontal bulk heat transport and a heat flux saturation effect. Coupled ion and energy equations and thermal flux equations are defined. A finite difference algorithm is applied to solve the equations, assuming an ionopause at 740 km altitude. Horizontal plasma flow velocities of 2.5-5.6 km/sec are found necessary in order to account for a dip in the ion temperature around the terminator and a sharp rise at about 140 deg, i.e., far past the solar zenith angle. An external heat source of 0.0001-0.0002 ergs/sq cm per sec, uniformly distributed around Venus, is required to maintain observed dayside and nightside ion temperatures. The heat source may be the solar wind, which would be sufficient without shocks.
Singhal R. P.
Whitten Robert C.
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