A one-dimensional model of the atmospheric electric field near the Venusian surface

Computer Science

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Atmospheric Electricity, Atmospheric Models, Electric Fields, Ion Production Rates, Planetary Meteorology, Venus Atmosphere, Venus Clouds, Atmospheric Boundary Layer, Atmospheric Composition, Cosmic Rays, Ionized Gases, Polarization (Charge Separation), Space Charge

Scientific paper

A one-dimensional model is developed for the development of an electric field below the Venus cloud layer, assuming an absence of cloud-to-ground lightning. The ion-bearing medium is considered as a collision dominated, partially ionized gas. Ion production by cosmic rays is accompanied by a sink of recombining positive and negative ions. The net diffusion of ions to the surface was examined, and modeled as resulting from differences between the ion diffusivities and electrical activity within the clouds. Calculations were made of the conduction and diffusion currents profiles, positive and negative ion densities, and the net space charge. Higher positive ion diffusivity was found to enhance the surface positive charge, producing an electric field which depended on the boundary layer mixing. Charge separation in the clouds also produces an electric field. Assuming a fair weather conduction current similar to earth leads to an electric field of 5 kV/sq m at the surface, with continuity to a few kilometers altitude.

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