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Spatial and temporal variations of the ion velocity measured in the venus ionosphere
Authors:KL Miller  WC Knudsen
Institution:

*Center for Atmospheric and Space Science, Utah State University, Logan, UT 84322-4405, U.S.A.

**Knudsen Geophysical Research, 18475 Twin Creeks Rd, Monte Sereno, CA 95030, U.S.A.

Abstract:The average velocity of the Venus ionosphere is nightward and approximately symmetric about the sun-Venus axis. We report here on temporal and spatial deviations from this average flow and their effects on the ionosphere. Temporal variability of the ion flux affects the main ionization source on the nightside. The influence of the solar wind is seen in the correlation between nightside ion density and ionopause height. Spatial asymmetries include a low-altitude superrotation (v-dawn < v-dusk) component related to superrotation of the neutral atmosphere, and a high-altitude prograde (v-dawn > v-dusk) component that is shown to be the result of asymmetric pressure gradients on the dayside.
Keywords:
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