Studies on the dynamics of Venus ionosphere - Effects of varying the ionopause height and the onset of turbulence

Details Studies on the dynamics of Venus ionosphere - Effects of varying the ionopause height and the onset of turbulence Studies on the dynamics of Venus ionosphere - Effects of varying the ionopause height and the onset of turbulence

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ijrsp..20..150s&link_type=abstract

Indian Journal of Radio and Space Physics (ISSN 0367-8393), vol. 20, April 1991, p. 150-156.

Physics

Space Physics

Ionopause, Ionospheric Ion Density, Magnetohydrodynamic Turbulence, Planetary Ionospheres, Solar Planetary Interactions, Venus Atmosphere, Finite Difference Theory, Magnetosphere-Ionosphere Coupling, Night Sky, Reynolds Number, Spectral Methods

Scientific paper

The conservation equations of plasma dynamics in the upper ionosphere of Venus have been solved by using a spectral method in the horizontal and finite differencing in the vertical direction. The effect of varying the ionopause height on the computed nightside ion densities is investigated. These ion densities show a sharp decrease as the ionopause altitude is reduced to 300 km. The effect of viscous forces on the horizontal plasma flow is investigated for a wide range of values of the coefficient of viscosity. The Reynolds numbers characteristics of the flow are calculated and the conditions for the onset of turbulence discussed. It is found that the Reynolds number can be large (greater than 1000) in the subsolar region for a coefficient of viscosity of up to 1.6 x 10 to the -10th g/cm s. The influence of magnetic fields on viscosity is also discussed.

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