A one-dimensional multispecies magnetohydrodynamic model of the dayside ionosphere of Venus

Physics

Scientific paper

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Atmospheric Models, Ionospheres, Magnetohydrodynamics, Space Plasmas, Venus Atmosphere, Ion Motion, Ionospheric Electron Density, Steady State, Time Dependence, Vertical Distribution

Scientific paper

Using a modification of the one-dimensional multispecies 'one-major-ion' MHD model of Shinagawa et al. (1987), the behaviors of plasma and magnetic field in the dayside ionosphere of Venus was studied for both time-dependent and steady-state conditions. The present model is more complete than the one-major-ion model of Shinagawa et al., although a comparison of the results indicated that the one-major-ion treatment was a fairly good approximation. Two new cases are presented, including steady-state conditions for the magnetized ionosphere, and the inclusion of ion loss due to horizontal transport in the magnetized region. The resulting calculated profiles of the magnetic field and the electron density agree much better with the observations at high altitudes than those without the ion loss terms, indicating the importance of the horizontal transport processes in the ionosphere of Venus at high altitudes.

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