Ratio of the ohmic dissipation time ﹩t_{\mathrm{dis}\,}﹩ to the Keplerian orbital period ﹩t_{\mathrm{K}\,}﹩ as a function of ﹩\vert z\vert ﹩ at ﹩r=1﹩ AU (solid curve) and 30 AU (dashed curve). The magnetic diffusivity is evaluated with the abundances of charged particles shown in Figs. 4 and 5 for the fiducial model. The dot‐dashed curve is for the case of ﹩f_{g}=10^{-4}﹩ at ﹩r=1﹩ AU.