Fig. 6.From: Derivation of characteristics of the relation between geomagnetic and geoelectric variation fields from the surface impedance for a two-layer earth(a): Absolute values of the surface impedances presented in Figs. 4 and 5. (b): Phase angles of the exact surface impedances (Eq. (4)) presented in Figs. 4 and 5. The phase angles of the approximate surface impedances obtained from Eqs. (16) and (21) are 90 degrees and zero, respectively.Back to article page