Relations between the Electric and Magnetic Field of a Wave of Very Long Period Induced in a Medium of Variable conductivity

摘要

The ratio between amplitudes and the difference of phages of pulsations of the magnetic and electric fields, recorded at the ground level, the periods of which being superior, to one second, depends, on the variation of the conductivity with the depth. In view of interpreting the results of the observations made at the "Centre de Physique du Globe" at Dourbes, various types of conductivity distributions are studied, and particularly a composite model, constituted of a uniform conductivity layer, extended by a medium where the conductivity variation if continuous, seems to-represent the experimental results.