Abstract
The differential equations of the dynamo theory for the terrestrial ionosphere are solved numerically under simplifying assumptions. The calculated current densities are used to estimate tidal velocities in the ionosphere necessary to produce the quiet day magnetic variations. A tidal amplification of about 60 compared with velocities on the ground is calculated. The calculated velocities and phases of vertical electron drifts are in reasonable agreement with experimental determinations of lunar tidal variations in measured virtual height of the different ionospheric layers. The calculated velocities and phases of horizontal electron drifts fit observations on long duration meteor echoes but the calculated phases are opposed to those obtained from fading measurements. The fading measurements appear therefore to refer to air movements and not to electron drifts.
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