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Let us conside r in more detail the weakening of the vertical magnetic field h.(t). From the analysis we eliminate values of h.(t) with t < 30 s, which are distorted by the finite length of the forefront of the interplanetary field impulse as well as by 5 s 104 km, i.e., 30 lunar radii. However, for a correct application of this model, the corrections for the lunar cavity must be introduced into experimental data. The calculations [Vanyan and Yegorov, 1973] show that in the antisolar point the effect of the cavity increases the vertical component by 11% when h, = 0.6/0.7, 9% when h, = 0.7/0.8, and 5% when h, = 0.8/0.9. In Figure 1 crosses and dots show the experimental values of h,(t) [Dyal and Parkin, 1971] and the values of h,(t) corrected for cavity effect, respectively. It is seen that the corrected values coincide with the curve calculated for the model with a conducting layer (model 1). So the night side data with 30 < t < 1200 s are in agreement with the conductivity distribution obtained from daytime observations. The same results were obtained by Schubert and Colburn [1971], who used another method. RESULTS