Improved Venus ionopause altitude calculation and comparison with measurement

Details Improved Venus ionopause altitude calculation and comparison with measurement Improved Venus ionopause altitude calculation and comparison with measurement

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2246k&link_type=abstract

Journal of Geophysical Research, vol. 87, Apr. 1, 1982, p. 2246-2254.

Physics

40

Atmospheric Stratification, Pioneer Venus Spacecraft, Planetary Ionospheres, Upper Ionosphere, Venus Atmosphere, Altitude, Atmospheric Pressure, Inviscid Flow, Newton Pressure Law, Prandtl-Meyer Expansion, Solar Wind, Terminator Lines, Zenith, Venus, Ionopause, Altitude, Comparisons, Procedure, Techniques, Rpa, Retarding Potential Analyzer, Pioneer Venus, Pressure, Ionosheath, Data, Solar Wind, Mathematical Models, Orbiter, Diagrams, Distance

Scientific paper

Improved approximations are incorporated into the inviscid fluid method originated by Spreiter et al (1970) in calculations of the altitude of the Venus ionopause. The altitude calculations are then compared with median altitudes measured by the Pioneer Venus retarding potential analyzer. The calculated ionopause shape is found to closely approximate the measured meridian shape in the solar zenith angle (SZA) range of zero-135 deg. The use of improved ionospheric pressure field ionosheath pressure and Prandtl-Meyer expansion approximations lowers the terminator ionopause altitude to approximately half that obtained with the usual Spreiter approximations. It is also determined that the calculated dawn ionopause is about 300 km higher than the dusk ionopause, and that both ionopauses are close to their respective measured meridian values. It is concluded that median ionopause altitude within the SZA angle range may be calculated without inclusion of a viscous interaction in the theory.

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