Abstract
RECENTLY, D. F. Martyn1 has suggested that electric currents in the D-layer of the ionosphere must make a contribution to the solar and lunar geomagnetic variations roughly equal to that of the E- and F-layers. Since theoretical work on atmospheric tides suggests that the tidal motions tend to increase with height, the electric forces causing the currents can scarcely be greater in the D-layer than in the E- and F-layers. Hence Martyn's suggestion implies that the integral conductivity of the D-layer must be at least as big as that of the E- and F-layers combined. This appears to us to be improbable.
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