抄録
Direct electrical conductivity of the ionosphere is examined mainly concerning the effect of Hall current. It is suggested that the effect of the electric field produced by vertical component of the Hall current, together with the smaller effect by its horizontal component, may construct, along the magnetic equator in the ionosphere, a narrow region, in which the conductivity near the level of the E layer is much greater than in the other latitudes. This result is considered to be very fit for the distribution with latitudes of the range or diurnal variation of the terrestrial magnetism.
