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Model Jovian ionospheres are constructed for comparison with Pioneer 10 results. Electron density maxima are predicted at a level approximately 220 kilometers above an assumed reference height where the hydrogen density is 10 to the 16-th power molecules per cubic centimeter. It may be possible to use observations of the electron density to locate the turbopause. Attention is drawn to a possible strong source of ionized sodium from Io which might lead to large electron densities at low altitudes.

Discussion of the effect of thermospheric winds on the emission profile of lambda 6300. It is shown that meridional winds play a significant role in determining the shape of this emission and that the conventional diffusion of O(super 1 D) hypothesis, although important, is not adequate to explain the observed features completely.