On a more precise calculation of the electric conductivity in the photosphere and in sunspots

On the basis of a review of data on the effective cross-sections of particle interactions, computations of the effective electron-neutron interaction, of the cross-section values for H, H₂ and He were carried out in the range 0.8 1.7 and 2.5 logP_g 6.5. The mean cross-sections for the solar mixture used by Zwaan were computed (see Table II). Using these results, the values of the electric conductivity and of its anisotropy coefficient were computed (see Tables VII and VIII), as well as other auxiliary quantities. The conductivity values obtained are in the range from 5 × 10⁹ to 5 × 10¹² CGSE units for the assumed physical conditions.On leave from the Astronomical Institute of the Czechoslovak Academy of Sciences, Ondejov, Czechoslovakia.